Over at Letters of Note is a great letter written in 1974 by an WWII veteran and pilot on his deathbed to his grandson:
But, in spite of what I've said, there is much, in life to enjoy – to relish. There is also much that can be done to make life worth while and living worth the "candle." There is a rich heritage of literature and music that awaits your investigation – it's there for the taking – in the libraries of the country and in the archives of the museums. There is poetry and prose – enough to fill all the hours you can spare to listen to them and more knowledge, on every conceivable subject, than you can assimilate in a lifetime. It's all there just waiting for you to ask for it or to seek it out. Don't overlook it or pass it up for less important or less meaningful pastimes.
Most important of all is ability to savor life, to taste of it in as many variances as you can – while you can. Life never looks so short as when you look back on it. Unfortunately you cannot do this until it has passed you by. So, as you go through life, don't overlook the "Lily in the Field," the newborn puppy, the fledgling bird – for they are as much (or more) of life as the tall buildings, the shiny automobiles and the possessions we tend to place so much importance upon. If you can do just this much – life will be more meaningful for you…
And my favorite paragraph, one that I would echo for my own children:
If I could package (with ribbon) those gifts that I would most like to give you, I would. But how do you package integrity, how do you wrap honesty, what kind of paper for a sense of humor, what ribbon for inquisitiveness?