The wise does at once what the fool does at last.
Either you run the day or the day runs you.
Go for it now. The future is promised to no one.
Problems are not stop signs, they are guidelines.
Be gentle to all and stern with yourself.
If you're going through hell, keep going.
It's always too early to quit.
Without hard work, nothing grows but weeds.
What you do today can improve all your tomorrows.
I can, therefore I am.
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
Our scientific power has outrun our spiritual power. We have guided missiles and misguided men.
Science investigates religion interprets. Science gives man knowledge which is power religion gives man wisdom which is control.
No amount of experimentation can ever prove me right a single experiment can prove me wrong.
Bad times have a scientific value. These are occasions a good learner would not miss.
Science does not know its debt to imagination.
Men love to wonder, and that is the seed of science.
The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.
Aerodynamically, the bumble bee shouldn't be able to fly, but the bumble bee doesn't know it so it goes on flying anyway.
Science never solves a problem without creating ten more.