“A spring never free from the pressure of some foreign body at last loses its elasticity; and so does the mind if other people’s thoughts are constantly forced upon it.”

“The print does not always have the same shape as the body that impressed it, and it doesn't always derive from the pressure of a body. At times it reproduces the impression a body has left in our mind: it is the print of an idea.”

“They were both overwhelmed by the sudden flatness that comes over American travellers in quiet foreign places. No stimuli worked upon them, no voices called them from without, no fragments of their own thoughts came suddenly from the minds of others.”

“The mind commands the body, and obedience is instant; the mind commands itself and meets resistance. The mind tells the hand to move, and all goes so smoothly that it is hard to distinguish the command from its execution. Yet the mind is the mind, and the hand is a body. The mind tells the mind to will; one is the same as the other, and yet it does not do what it is told.”

“Scripture makes it clear that these responses are not forced upon us by the pressures of the situation. What I do comes from inside me. The things that happen to me will influence my responses but never determine them. Rather, these responses flow out of the thoughts and motives of my heart.”

“Iron rusts from disuse, stagnant water loses its purity, and in cold weather becomes frozen; even so does inaction sap the vigors of the mind.”