Do not be afraid. Do not be satisfied with mediocrity. Put out into the deep and let down your nets for a catch.
The expectations of life depend upon diligence; the mechanic that would perfect his work must first sharpen his tools.
Lack of direction, not lack of time, is the problem. We all have twenty-four hour days.
Give yourself something to work toward - constantly.
Determine never to be idle. No person will have occasion to complain of the want of time, who never loses any. It is wonderful how much may be done, if we are always doing.
Freedom from the desire for an answer is essential to the understanding of a problem.
Perseverance and spirit have done wonders in all ages.
My optimism wears heavy boots and is loud.
The starting point of all achievement is desire.
Keep your face always toward the sunshine - and shadows will fall behind you.
The fact that the great scientist believed in flying machines was the one thing that encouraged us to begin our studies.
You see things; you say, 'Why?' But I dream things that never were; and I say 'Why not?
The real man smiles in trouble, gathers strength from distress, and grows brave by reflection.
Become a possibilitarian. No matter how dark things seem to be or actually are, raise your sights and see possibilities -- always see them, for they're always there.
After climbing a great hill, one only finds that there are many more hills to climb.
I'm sorry I wrote you such a long letter; I didn't have time to write a short one.
Others have seen what is and asked why. I have seen what could be and asked why not.
I will take fate by the throat; it will never bend me completely to its will.
You'll never do a whole lot unless you're brave enough to try.
I will never be by violence constrained to do anything.
Always remember you are braver than you believe, stronger than you seem, smarter than you think and twice as beautiful as you’ve ever imagined.