If you think you can do it, you can.
Without hard work, nothing grows but weeds.
What you do today can improve all your tomorrows.
If you've got a talent, protect it.
You never know what motivates you.
Problems are not stop signs, they are guidelines.
By failing to prepare, you are preparing to fail.
Be gentle to all and stern with yourself.
Things do not happen. Things are made to happen.
If you're going through hell, keep going.
But I don't think we'll go there until we go back to the moon and develop a technology base for living and working and transporting ourselves through space.