I think and think and think, I?ve thought myself out of happiness one million times, but never once into it.
Reading furnishes the mind only with materials of knowledge; it is thinking that makes what we read ours.
The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.
Think before you speak. Read before you think.
It is the mark of an educated mind to be able to entertain a thought without accepting it.
Whether you think you can, or you think you can't--you're right.
The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it.