I tend to be more of a melancholy than sanguine, so this quote serves as a good reminder for me.
"No one in life occupies a position so humble, be it in the smallest hamlet or the largest city, that he cannot manifest his moral strength and exercise it. There is none so obscure that he cannot make the lives of those around him marvelously changed, brightened and inspired if he would merely progressively live up to his expanding possibilities in the way of kindness, thoughtfulness, cheer, good-will, influence and optimism.
Better by far is it for the individual to be a live coal, radiating light and heat for a day, than to be an icicle for a century. It is better to be an oasis of freshness and inspiration, if the oasis is no larger even than a table-cloth, than a desert of dreariness -- larger than the Sahara. We can all be intensive, even if we cannot yet be extensive; deep, if we cannot be wide; concentrated, if we cannot be diffused. The smallest pool of water can mirror the sun; it does not require an ocean. Let us live up to our possibilities for a single day, and we will not have to die to get to heaven; we will be making heaven for ourselves and for others right here -- today on this little spinning globe we call the earth." William George Jordan.