We are often able because we ...

We are often able because we think we are able.
 Josiah Johnson Hawes

Quotes from the same author

You may be whatever you resolve to be - determine to be something in the world and you will be something. " I cannot," never accomplished anything. "I will try" has worked wonders.
 Josiah Johnson Hawes
A good character is, in all cases, the fruit of personal exertion. It is not inherited from parents; it is not created by external advantages; it is no necessary appendage of birth, wealth, talents, or station; but it is the result of one's own endeavors-the fruit and reward of good principles manifested in a course of virtuous and honorable action.
 Josiah Johnson Hawes