Expect problems and eat them for breakfast.
Quality is not an act, it is a habit.
If you can dream it, you can do it.
If you think you can do it, you can.
Without hard work, nothing grows but weeds.
Be gentle to all and stern with yourself.
You never know what motivates you.
The wise does at once what the fool does at last.
The dog that trots about finds a bone.
Well done is better than well said.
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.