[We] have irony as the infinite absolute negativity. It is negativity, because it only negates; it is infinite, because it does not negate this or that phenomenon; it is absolute, because that by virtue of which it negates is a higher something that still is not (p. 261).
Irony is indeed free, free from the sorrows of actuality, but also free from its joys, free from its blessing, for inasmuch as it has nothing higher than itself, it can receive no blessing (p. 279).
As the ironist poetically composes himself and his environment with the greatest possible poetic license, as he lives in this totally hypothetical and subjunctive way, his life loses all continuity. He succumbs completely to mood. His life is nothing but moods (p. 284).
[W]hat doubt is to science, irony is to personal life (p. 326).
– Soren Kierkegaard, The Concept of Irony (1841)