The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way.
A man is the part he plays among his fellows. He is not isolated; he cannot be. His life is made up of the relations he bears to others - is made or marred by those relations, guided by them, judged by them, expressed in them. There is nothing else upon which he can spend his spirit - nothing else that we can see. It is by these he gets his spiritual growth; it is by these we see his character revealed, his purpose, his gifts. A few (men) act as those who have mastered the secrets of a serious art, with deliberate subordination of themselves to the great end and motive of the play. These have "found themselves," and have all the ease of a perfect adjustment.
History with its flickering lamp stumbles along the trail of the past, trying to reconstruct its scenes, to revive its echoes, and kindle with pale gleams the passion of former days. What is the worth of all this? The only guide to a man is his conscience; the only shield to his memory is the rectitude and sincerity of his actions. It is very imprudent to walk through life without this shield, because we are so often mocked by the failure of our hopes and the upsetting of our calculations; but with this shield, however the fate may play, we march always in the ranks of honor.
Winston Churchill (1874 - 1965)
Source: Tribute to Neville Chamberlain, House of Commons, November 1940