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Unless you're involved with thinking about what you're doing, you end up doing the same thing over and over, and that becomes tedious and, in the end, defeating.

The simplest principles become difficult of practice, when habits, formed in error, have been fixed by time, and the simplest truths hard to receive when prejudice has warped the mind.

Some habits of ineffectiveness are rooted in our social conditioning toward quick-fix, short-term thinking.

When you are working really hard and you're really focused on your career, a lot of other things suffer.

Instead of focusing on that circumstances that you cannot change - focus strongly and powerfully on the circumstances that you can.

Difficult times often bring out the best in people.

Exceptionally hard decisions can deplete your energy to the point at which you finally cave in. If you mentally crumble and degenerate into negative thinking, you'll magnify the problem to the point where it can haunt you.

My mind 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. But I abhor the dull routine of existence. I crave for mental exaltation.

Thinking is hard work. One can't bear burdens and ideas at the same time.