Hatred is a feeling which leads to the extinction of values.
Thought is not a gift to man but a laborious, precarious and volatile acquisition.
The world is the sum-total of our vital possibilities.
Life is a struggle with things to maintain itself among them. Concepts are the strategic plan we form in answer to the attack.
Thinking is the desire to gain reality by means of ideas.
Man in a word has no nature; what he has... is history.