Don't measure yourself by ...

Don\'t measure yourself by what you have accomplished, but by what you should have accomplished with your ability. Do not let what you cannot do interfere with what you can do. Be more concerned with your character than with your reputation. Your character is what you really are while your reputation is merely what others think you are. Failure to prepare is preparing to fail.
Don't measure yourself by what you have accomplished, but by what you should have accomplished with your ability. Do not let what you cannot do interfere with what you can do. Be more concerned with your character than with your reputation. Your character is what you really are while your reputation is merely what others think you are. Failure to prepare is preparing to fail.

Quotes from the same author

Whatever you do in life, surround yourself with smart people who'll argue with you.
You can't let praise or criticism get to you. It's a weakness to get caught up in either one.
Never mistake activity for achievement.
Talent is God given. Be humble. Fame is man-given. Be grateful. Conceit is self-given. Be careful.
Be true to yourself, help others, make each day your masterpiece, make friendship a fine art, drink deeply from good books - especially the Bible, build a shelter against a rainy day, give thanks for your blessings and pray for guidance every day.