Anxiety is the dizziness of freedom.

The unhappy person is never present to themself because they always live in the past or the future.

Job endured everything - until his friends came to comfort him, then he grew impatient.

If the ethical - that is, social morality- is the highest ... then no categories are needed other than the Greek philosophical categories.

My tactics were, by God's aid, to employ every means to make it clear what the requirement of Christianity truly is.

The idea of demonstrating that this unknown something [God] exists, could scarcely suggest itself to Reason. For if God does not exist it would of course be impossible to prove it, and if he does exist it would be folly to attempt it.

Death induces the sensual person to say: Let us eat and drink, because tomorrow we shall die - but this is sensuality's cowardly lust for life, that contemptible order of things where one lives in order to eat and drink instead of eating and drinking in order to live.