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“In order to be company he must display a certain mental activity. But it need not be of a high order. Indeed it might be argued the lower the better. Up to a point. The lower the order of mental activity the better the company. Up to a point.”
― Samuel Beckett, Company

“Maintain an active mind: alert to the possibilities and mischievous in your pursuit of them.”
― Stewart Stafford

“Exercise your mind the same as you would exercise your body. Practice healthy mental habits that will help you, empower you, and improve your perspectives. Practice them daily.”
― Akiroq Brost

“It is relatively easy to think of and be conscious of physical acts. It is much harder to think of mental acts, as the beginning analytical reader must do; in a sense, he is thinking about his own thoughts. Most of us are unaccustomed to doing this. Nevertheless, it can be done, and a person who does it cannot help learning to read much better.
(P. 55)”
― Mortimer J. Adler, Charles Van Doren, How to Read a Book: The Classic Guide to Intelligent Reading