The only source of knowledge is experience.

• Common sense is the collection of prejudices acquired by age eighteen.
• Reading, after a certain age, diverts the mind too much from its creative pursuits. Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.
• Confusion of goals and perfection of means seems, in my opinion, to characterize our age.
• Perfection of means and confusion of ends seem to characterize our age.
• It is strange to be known so universally and yet to be so lonely.
• Anger dwells only in the bosom of fools.
• True art is characterized by an irresistible urge in the creative artist.
• The most beautiful thing we can experience is the mysterious. It is the source of all true art and science.
• It is the supreme art of the teacher to awaken joy in creative expression and knowledge.
• Weakness of attitude becomes weakness of character.