First, anyone who seriously intends to become a philosopher
must "once in his life" withdraw into himself and attempt,
within himself, to overthrow and build anew all the sciences
that, up to then, he has been accepting. Philosophy wisdom
(sagesse) is the philosophizer's quite personal affair. It must
arise as His wisdom, as his self-acquired knowledge tending
toward universality, a knowledge for which he can answer from
the beginning, and at each step, by virtue of his own absolute
insights.

Author: Edmund Husserl