A man’s measure is how long and how far he can endure being alone without the understanding of others. Someone who, even in the decisions of eternity, could endure being alone a whole lifetime is the furthest from the infant, and from the socializer who represents the animal side of humanity.

From his Papers and Journals, which is a treasure trove of redpill quotes.

He commented on the cuckolding of men in society 200 years ago:

THE PRESENT HUMAN RACE is so devoid of spirit that people have altogether ceased thinking of their worth in terms of being ‘spirit’; their only self-respect is in more or less animal terms. Remember those officiating Christian priests, now departed, who thought to crush men by calling them hypocrites, ungodly, etc. This would have no effect at all on today’s people. Nor will the ‘fornicator’ metaphor used in the Bible have any effect, for fornicators themselves even think of their worth in animal terms. No, we must change our way of talking. Somewhere else […] I have suggested a provocative figure of speech, namely that they are spiritual cuckolds – and it corresponds exactly with a cuckold who continues living together with his wife in the married state but in the knowledge that he is continually being cuckolded; that is just like having a religion which one regards as a fable, but being too spineless to have the courage to do one thing or the other. This kind of accusation provokes, and it has the additional value of prostituting [men] in the eyes of women, which is what they so much fear, seeing that, as noted, self-esteem qua animal creatures is the only self-esteem they possess, just as the relation to the opposite sex has also been made into the meaning and earnest of life – into true Christianity.

Link to the source: https://www.amazon.co.uk/Papers-Journals-Selection-Penguin-Classics-ebook/dp/B00WFN1TSM/ref=sr_1_1?keywords=kierkegaard+journals&qid=1559481131&s=gateway&sr=8-1-spell