Just as no one can be forced into belief, so no one can be forced into unbelief.

Let us consider the polarity of love and hate.... Now, clinical observation shows not only that love is with unexpected regularityaccompanied by hate (ambivalence), and not only that in human relationships hate is frequently a forerunner of love, but also that in many circumstances hate changes into love and love into hate.

Intolerance of groups is often, strangely enough, exhibited more strongly against small differences than against fundamental ones.

What we call happiness in the strictest sense comes from the (preferably sudden) satisfaction of needs which have been dammed up to a high degree.

When making a decision of minor importance, I have always found it advantageous to consider all the pros and cons.

If youth knew; if age could.

Religious illusion must bow to scientific truth. It is in total error about the nature of the true world. Only science is not an illusion.