A view of the inside or interior; 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.
Introspection and preserved writings give us far more insight into the ways of past humans than we have into the ways of past dinosaurs. For that reason, I'm optimistic that we can eventually arrive at convincing explanations for these broadest patterns of human history. Jared Diamond
The philosophy of the wisest man that ever existed, is mainly derived from the act of introspection. William Godwin
I have my moments. Ever since I was a boy, I never was someone who was at ease with happiness. Too often I embrace introspection and self-doubt. I wish I could embrace the good things. Hugh Laurie