What you know is only half of the equation.

The average person puts only 25% of his energy and ability into his work. The world takes off its hat to those who put in more than 50% of their capacity, and stands on its head for those few and far between souls who devote 100%.

Stand up to your obstacles and do something about them. You will find that they haven't half the strength you think they have.

If you spend too much time thinking about a thing, you'll never get it done.

A happy life consists not in the absence, but in the mastery of hardships.

The difference between what we do and what we are capable of doing would suffice to solve most of the world’s problems.

Do not think that what is hard for you to master is humanly impossible; but if a thing is humanly possible, consider it to be within your reach.

Start writing, no matter what. The water does not flow until the faucet is turned on.

Two of the hardest tests in life: The patience to wait for the right moment and the courage to accept whatever you encounter.

Knowledge rests not upon truth alone, but upon error also.

No one can draw more out of things, books included, than he already knows. A man has no ears for that to which experience has given him no access.

When I examine myself and my methods of thought, I come to the conclusion that the gift of fantasy has meant more to me than my talent for absorbing positive knowledge.

A little knowledge that acts is worth infinitely more than much knowledge that is idle.

One cannot conceive anything so strange and so implausible that it has not already been said by one philosopher or another.