Nothing is perfect on the human stage.

There is nothing wrong in change, if it is in the right direction. To improve is to change, so to be perfect is to have changed often.

Perfect solutions of our difficulties are not to be looked for in an imperfect world.

To improve is to change; to be perfect is to change often.

Don't expect your friend to be a perfect person. Help your friend to become a perfect person. That is true friendship.

We must, even in our honest political fervor, fear neither partisan criticism nor self-criticism. For the pretense of perfection is not one of the marks of good public servants.