Be strong enough to know when you are weak, and brave enough to face yourself when you are afraid.
Be proud and unbending in honest failure, but humble and gentle in success.
Never substitute words for actions.
Don't seek the path of comfort, but face the stress and spur of difficulty and challenge.
Learn to stand up in the storm, but have compassion for those who fall.
Master yourself before you seek to master others.
Have a heart that is clean, and a goal that is high.
Learn to laugh, but never forget how to weep.
Reach into the future, but never neglect the past.
Be serious, but never take yourself too seriously.
Be modest, so that you will remember the simplicity of true greatness, the open mind of true wisdom, and the meekness of true strength.
From General Douglas MacArthur's Sylvanus Thayer Award acceptance address. Credit goes to American Rhetoric for the speech. The full text of the speech is here.