If you think you can do it, you can.
Without hard work, nothing grows but weeds.
You never know what motivates you.
Always desire to learn something useful.
Be thine own palace, or the world's thy jail.
If you can dream it, you can do it.
After a storm comes a calm.
If you're going through hell, keep going.
The most effective way to do it, is to do it.
Never complain and never explain.
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.