“It will, of course, be understood that directly or indirectly, soon or late, every advance in the sciences of human nature will contribute to our success in controlling human nature and changing it...”

“Human beings are accustomed to think of intellect as the power of having and controlling ideas and of ability to learn as synonymous with ability to have ideas. But learning by having ideas is real...”

“Just as the science and art of agriculture depend upon chemistry and botany, so the art of education depends upon physiology and psychology.”

“Psychology is the science of the intellects, characters and behavior of animals including man.”

“Human folk are as a matter of fact eager to find intelligence in animals.”

“From the lowest animals of which we can affirm intelligence up to man this type of intellect is found.”

“When man will return to nature, nature will return to him.”

“The sky is an enormous man.”

“When the full-grown poet came,Out spake pleased Nature (the round impassive globe, with all its shows of day and night,) saying, He is mine;But out spake too the Soul of man, proud, jealous and unr...”

“My mind," he said, "rebels at stagnation. Give me problems, give me work, give me the most abstruse cryptogram or the most intricate analysis, and I am in my own proper atmosphere. I can dispense t...”

“Running is a mental sport, more than anything else. You're only as good as your training, and your training is only as good as your thinking.”

“Everything has been created twice once on a mental plain and once on a physical plain.”

“The imagination is part of the arsenal that actors draw from.”

“There is no such thing as part freedom.”