KIERKEGAARD23

I will no longer talk to the world; I will try to forget that I ever did. [...] The trouble is that as soon as one comes up with anything, one becomes it oneself... I have barely to read or think of some illness before having it.
Every time I want to say something, at precisely the same time someone else says it. It's as if I were a double thinker and my other I was always one step ahead; or while I stand and talk everyone thinks it's someone else. [1836-7]

I will not lament the past--why lament? I will work with vigour and not waste time on regrets like the man stuck in a bog who wanted first to calculate how far he had sunk without realizing that in the time spent on that he was sinking still deeper. [Gilleleje, 1 August 1835]

Idleness is by no means as such a root of evil; on the contrary, it is a truly divine life, provided one is not himself bored. Idleness may indeed cause the loss of one's fortune, and so on, but the high-minded man does not fear such dangers; he fears only boredom. [Either/Or, VOL. I: THE ROTATION METHOD]

If a believer were to implore God to put his faith to the test, then this is not an indication of the believer's having faith to an extraordinary degree (to think that is a poetic misunderstanding, as it is also a misunderstanding to have faith to an "extraordinary" degree, since the ordinary degree of faith is the highest), but it indicates that he does not quite have faith, for "thou shalt believe." [Works of Love]

If a man lived on a desert island, if he developed his mind in harmony with the commandment, then by renouncing self-love he could be said to love his neighbor. [Works of Love]

...if a man's life is not to be dozed away in inactivity or wasted in bustling movement, there must be something higher which draws it. [Training in Christianity]

If a person does not become what he can understand, then he does not really understand it. Only Themistocles understood Miltiades; so he became that too. [1846]

If an Arab in the desert were suddenly to discover a spring in his tent, and so would always be able to have water in abundance, how fortunate he would consider himself--so too, when a man who qua physical being is always turned towards the outside, thinking that his happiness lies outside him, finally turns inward and discovers that the source is within him; not to mention his discovering that the source is his relation to God.

If Christianity were a doctrine, the relationship to it would not be one of faith, for only an intellectual type of relationship can correspond to a doctrine. Christianity is therefore not a doctrine, but the fact that God has existed.
The realm of faith is thus not a class for numskulls in the sphere of the intellectual, or an asylum for the feeble-minded. Faith constitutes a sphere all by itself, and every misunderstanding of Christianity may at once be recognized by its transforming it into a doctrine, transferring it to the sphere of the intellectual. The maximum of attainment within the sphere of the intellectual, namely, to become completely indifferent as to the reality of the teacher, is in the sphere of faith at the opposite end of the scale. The maximum of attainment within the sphere of faith is to become infinitely interested in the reality of the teacher.... [Concluding Unscientific Postscript]