KIERKEGAARD24

If from a pagan point of view one were to warn against self-slaughter, it must be by a long detour, by showin that it ws breach of duty toward one's fellow men. The point in self-slaughter, that it is a crime against God, entirely escapes the pagan. [The Sickness unto Death]

If God has given one greater abilities, one must deny one's divine vocation and be like other men. [...said sarcastically, of course... 1847]

If I had had faith, I should have remained with Regina. [May 17, 1843]

If I were to give a fuller account of my life's inner understanding of the particular, this would grow into a whole folio which only very few would have the ability and seriousness to understand. But nor do I have time to record anything like that. ["How I Have Understood Myself in the Whole Author Activity", 1846]

If I were to wish for anything, I should not wish for wealth and power, but for the passionate sense of the potential, for the eye which, ever young and ardent, sees the possible. Pleasure dissappoints, possibility never. And what wine is so foaming, what so fragrant, what so intoxicating, as possibility! [Either/Or, VOL. I: DIAPSALMATA]

If marriage has reality, then he is sufficiently punished by forfeiting this happiness; if it has no reality, it is absurd to abuse him because he is wiser than the rest. When a man grows tired of his money and throws it out the window, we do not call him a scoundrel; for either money has reality, and so he is sufficiently punished by depriving himself of it, or it has none, and then he is, of course, a wise man. [Either/Or, VOL. I: THE ROTATION METHOD]

If someone believes that he has faith and yet is indifferent to his possession, neither cold nor warm, then he can be sure that he does not have faith. If someone believes that he is a Christian and yet is indifferent to the fact that he is, then he truly is not a Christian. What would we think about a man who protested that he was in love, and also stated that it was a matter of indifference to him? [Works of Love]

If the teacher serves as an occasion by means of which the learner is reminded, he cannot help the learner to recall that he really knows the Truth; for the learner is in a state of Error. What the Teacher can give him occasion to remember is, that he is in Error. [Philosophical Fragments]

If there was anything to be done through natural science in the way of defining spirit I'd be the first to get my hands on a microscope and hope to persevere as well as any. [1846]

If we human beings are mere shadows, as is sometimes said, He is eternal clearness in eternal unchangeableness. ["The Unchangeableness of God"]

If you can do that, if you can find exactly the place whree the other is and begin there, you may perhaps have the luck to lead him to the place where you are.
For to be a teacher does not mean simply to affirm that such a thing is so, or to deliver a lecture, &c. No, to be a teacher in the right sense is to be a learner. Instruction begins when you, the teacher, learn from the learner, put yourself in his place so that you may understand what he understands and in the way he understands it, in case you have not understood it before. [The Point of View]