One Thing Necessary

We cannot master everything, taste everything, understand everything, drain every experience to its last dregs. But if we have the courage to let almost everything else go, we will probably be able to retain the one thing necessary for us - whatever it may be.
If we are too eager to have everything, we will almost certainly miss even the one thing we need. Happiness consists in finding out precisely what the ‘one thing necessary’ may be, in our lives, and in gladly relinquishing all the rest.
~ Thomas Merton