It's always too early to quit.
The wise does at once what the fool does at last.
Always desire to learn something useful.
Well done is better than well said.
Wherever you are - be all there.
What you do today can improve all your tomorrows.
Be kind whenever possible. It is always possible.
Expect problems and eat them for breakfast.
You never know what motivates you.
Who seeks shall find.
It's amazing that something only an atom thick can be an impenetrable barrier. You can have gas on one side and vacuum or liquid on the other, and with a wall only one atom thick, nothing would go through it.