Problems are not stop signs, they are guidelines.
Either you run the day or the day runs you.
What you do today can improve all your tomorrows.
Without hard work, nothing grows but weeds.
Only the educated are free.
The most effective way to do it, is to do it.
If you think you can do it, you can.
Well done is better than well said.
Be gentle to all and stern with yourself.
The dog that trots about finds a bone.
Science is a self-sufficient activity.
The thing about science is that it's an accurate picture of the world.