All failures - neurotics, psychotics, criminals, drunkards, problem children, suicides, perverts, and prostitutes - are failures because they are lacking in social interest

Meanings are not determined by situations, but we determine ourselves by the meanings we give to situations.

What is courage? Courage is the willingness to risk failure...There is only one danger I find in life, and that, indeed, is a real one. You may take too many precautions.

All failures - neurotics, psychotics, criminals, drunkards, problem children, suicides, perverts, and prostitutes - are failures because they are lacking in social interest

In this case, the neurotic resembles a human being who looks up to God, commends himself to His ways, and then religiously awaits how the Lord will guide him; he is nailed to the cross of his fiction.

Each generation has its few great mathematicians, and mathematics would not even notice the absence of the others. They are useful as teachers, and their research harms no one, but it is of no importance at all. A mathematician is great or he is nothing.

The goal of the human soul is conquest, perfection, security, superiority.