Things do not happen. Things are made to happen.
The wise does at once what the fool does at last.
You never know what motivates you.
Go for it now. The future is promised to no one.
Leap, and the net will appear.
Expect problems and eat them for breakfast.
Only the educated are free.
The most effective way to do it, is to do it.
By failing to prepare, you are preparing to fail.
If you're going through hell, keep going.
Triumphant science and technology are only at the threshold of man's command over sources of energy so stupendous that, if used for military purposes, they can wipe out our entire civilization.