Action is the real measure of intelligence.
Once you replace negative thoughts with positive ones you’ll start having positive results.
Judge a man by his questions rather than by his answers.
No problem can withstand the assault of sustained thinking.
Francois-Marie Arouet de Voltaire
If what you are doing won’t withstand analysis, you probably shouldn’t be doing it.
To find yourself, think for yourself.
It’s better to walk alone, than with a crowd in the wrong direction.
The speech/text by David Foster Wallace alone is already absolutely incredible, but the video makes it even better. Enjoy and take something out of it:
Life is a mirror and will reflect back to the thinker what he thinks into it.
Again, this one is about success and achievement:
I can give you a six-word formula for success: Think things through – then follow through.
Edward V. Rickenbacker