Self-examination
Part of speech: noun
Definition: An examination of oneself.
Introspection
Part of speech: noun
Definition: A looking inward; specifically, the act or process of self-examination, or inspection of one's own thoughts and feelings; the cognition which the mind has of its own acts and states; self-consciousness; reflection.
Example sentence: Passion is something that's hard to discover purely through introspection. You have to have experiences - you have to learn real-time and through experiences what makes you tick.