Cyprian, Bishop of Carthage, on Demonization and Exorcisms in 250CE

And this also is done in the present day, in that the devil is scourged, and burned, and tortured by exorcists, by the human voice, and by divine power… Oh, would you but hear and see them when they are adjured by us, and tortured with spiritual scourges, and are ejected from the possessed bodies with tortures of words, when howling and groaning at the voice of man and the power of God, feeling the stripes and blows, they confess the judgment to come! Come and acknowledge that what we say is true; and since you say that you thus worship gods, believe even those whom you worship.

Or if you will even believe yourself, he—i.e., the demon—who has now possessed your breast, who has now darkened your mind with the night of ignorance, shall speak concerning yourself in your hearing. You will see that we are entreated by those whom you entreat, that we are feared by those whom you fear, whom you adore. You will see that under our hands they stand bound, and tremble as captives, whom you look up to and venerate as lords: assuredly even thus you might be confounded in those errors of yours, when you see and hear your gods, at once upon our interrogation betraying what they are, and even in your presence unable to conceal those deceits and trickeries of theirs.

Ignatius of Antioch to the Church at Rome, on His Way to Be Martyred in 105CE

Only request in my behalf both inward and outward strength, that I may not only speak, but [truly] will; and that I may not merely be called a Christian, but really be found to be one. For if I be truly found [a Christian], I may also be called one, and be then deemed faithful, when I shall no longer appear to the world. Nothing visible is eternal. “For the things which are seen are temporal, but the things which are not seen are eternal.” For our God, Jesus Christ, now that He is with the Father, is all the more revealed [in His glory]. Christianity is not a thing of silence only, but also of [manifest] greatness. ...

May I enjoy the wild beasts that are prepared for me; and I pray that they may be found eager to rush upon me, which also I will entice to devour me speedily, and not deal with me as with some, whom, out of fear, they have not touched. But if they be unwilling to assail me, I will compel them to do so. Pardon me [in this] I know what is for my benefit. Now I begin to be a disciple, and have no desire after anything visible or invisible, that I may attain to Jesus Christ. Let fire and the cross; let the crowds of wild beasts; let breakings, tearings, and separations of bones; let cutting off of members; let bruising to pieces of the whole body; and let the very torment of the devil come upon me: only let me attain to Jesus Christ.

All the pleasures of the world, and all the kingdoms of this earth, shall profit me nothing. It is better for me to die in behalf of Jesus Christ, than to reign over all the ends of the earth. “For what shall a man be profited, if he gain the whole world, but lose his own soul?” Him I seek, who died for us: Him I desire, who rose again for our sake. This is the gain which is laid up for me. ... Do not speak of Jesus Christ, and yet prefer this world to Him.

A Description of the Early Christians from Justin Martyr in 160CE

We who were filled with war, and mutual slaughter, and every wickedness, have each through the whole earth changed our warlike weapons, — our swords into ploughshares, and our spears into implements of tillage, — and we cultivate piety, righteousness, philanthropy, faith, and hope, which we have from the Father Himself through Him who was crucified… 

Now it is evident that no one can terrify or subdue us who have believed in Jesus over all the world. For it is plain that, though beheaded, and crucified, and thrown to wild beasts, and chains, and fire, and all other kinds of torture, we do not give up our confession; but the more such things happen, the more do others and in larger numbers become faithful, and worshippers of God through the name of Jesus. For just as if one should cut away the fruit-bearing parts of a vine, it grows up again, and yields other branches flourishing and fruitful; even so the same thing happens with us.

A description of the early Christians from Aristides in 125CE

“The Christians, O King, went about and searched, and they have found the truth. As I have learned from their writings, they have come nearer to the truth and genuine knowledge than the rest of the nations. For they know and trust in God, the Creator of heaven and of earth, in whom and from whom are all things. …

Therefore, they do not commit adultery or fornication. They do not bear false witness. They do not embezzle what is held in pledge, nor do they covet that which is not theirs. They honor father and mother and show kindness to those who are near them. Whenever they are judges, they judge uprightly. They do not worship idols made in the likeness of man. Whatever they would not wish others to do to them, they do not do to others. They do not eat food consecrated to idols, for they are pure. They comfort their oppressors and make them their friends. They do good to their enemies. … They follow the commandments of their Christ with much care, living justly and seriously, just as the Lord their God commanded them.”

A description of the early Christians from Athenagoras in 175CE

If I go minutely into the particulars of our doctrine, let it not surprise you. It is that you may not be carried away by the popular and irrational opinion, but may have the truth clearly before you. For presenting the opinions themselves to which we adhere, as being not human but uttered and taught by God, we shall be able to persuade you not to think of us as atheists. What, then, are those teachings in which we are brought up? “I say unto you, Love your enemies; bless them that curse you; pray for them that persecute you; that ye may be the sons of your Father who is in heaven, who causes His sun to rise on the evil and the good, and sends rain on the just and the unjust.”

Allow me here to lift up my voice boldly in loud and audible outcry, pleading as I do before philosophic princes. For who of those that reduce syllogisms, and clear up ambiguities, and explain etymologies, or of those who teach homonyms and synonyms, and predicaments and axioms, and what is the subject and what the predicate, and who promise their disciples by these and such like instructions to make them happy: who of them have so purged their souls as, instead of hating their enemies, to love them; and, instead of speaking ill of those who have reviled them (to abstain from which is of itself an evidence of no mean forbearance), to bless them; and to pray for those who plot against their lives?

On the contrary, they never cease with evil intent to search out skillfully the secrets of their art, and are ever bent on working some ill, making the art of words and not the exhibition of deeds their business and profession. But among us you will find uneducated persons, and artisans, and old women, who, if they are unable in words to prove the benefit of our doctrine, yet by their deeds exhibit the benefit arising from their persuasion of its truth: they do not rehearse speeches, but exhibit good works; when struck, they do not strike again; when robbed, they do not go to law; they give to those that ask of them, and love their neighbors as themselves.

A description of the early Christians from a Letter to Diognetus in 125-200CE

Christians cannot be distinguished from the rest of humankind by country, speech or customs. They do not live in cities of their own; they do not speak a special language; they do not follow a peculiar manner of life. … They live in their own countries, but only as guests and aliens.  They take part in everything as citizens and endure everything as aliens.  Every foreign country is their homeland, and every homeland is a foreign country to them.  They marry like everyone else. They beget children, but they do not expose them after they are born. They have a common table, but not a common bed. They are in the flesh, but they do not live according to the flesh.

They live on earth, but their citizenship is in heaven. They obey the established laws, but through their life they surpass these laws. They love all people and are persecuted by all.  Nobody knows them, and yet they are condemned. They are put to death, and just through this, they are brought to life. They are poor as beggars, and yet they make many rich. They lack everything, and yet they have everything in abundance. They are dishonored, and yet have their glory in this very dishonor. They are insulted, and just in this they are vindicated. They are abused, and yet they bless. They are assaulted, and yet it is they who show respect. Doing good, they are sentenced like evildoers. When punished with death, they rejoice in the certainty of being awakened to life. …

In a word: what the soul is in the body, the Christians are in the world.