With every increase in the degree of consciousness, and in proportion to that increase, the intensity of despair increases: the more consciousness th… - Søren Kierkegaard

One can very well eat lettuce before its heart has been formed; still, the delicate crispness of the heart and its lovely frizz are something altogether different from the leaves. It is the same in the world of the spirit. Being too busy has this result: that an individual very, very rarely is permitted to form a heart; on the other hand, the thinker, the poet, or the religious personality who actually has formed his heart, will never be popular, not because he is difficult, but because it demands quiet and prolonged working with oneself and intimate knowledge of oneself as well as a certain isolation.

So to be sick unto death is not to be able to die — yet not as though there were hope of life; no, the hopelessness in this case is that even the last hope, death, is not available. When death is the greatest danger, one hopes for life; but when one becomes acquainted with an even more dreadful danger, one hopes for death. So when the danger is so great that death has become one's hope, despair is the disconsolateness of not being able to die.

Once you are born in this world you’re old enough to die.