A pessimist sees the difficulty in every opportunity;
an optimist sees the opportunity in every difficulty.
The measure of intelligence is the ability to change
The simplest things are often the truest.
Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it
If you want something you've never had, you must be willing to do something you've never done
We are what we repeatedly do.
Excellence, therefore, is not an act, but a habit