The scientist believes in proof without certainty.
Hatred is love frustrated.
For the person and for the species love is the form of behavior having the highest survival value.
All education should be directed toward the refinement of the individual's sensibilities in relation not only to one's fellow humans everywhere, but to all living things whatsoever.
The basic fact is simple: life begins not at birth, but conception.
... the main principle by which human beings must guide the future course of their development is love.