Some salient thoughts from Thoreau:
Take time by the forelock. Now or never!
You must live in the present, launch yourself on every wave, find your eternity in each moment. Fools stand on their island opportunities and look toward another land. There is no other land; there is no other life but this, or the like of this. Where the good husbandman is, there is the good soil. Take any other course, and life will be a succession of regrets. Let us see vessels sailing prosperously before the wind, and not simply stranded barks. There is no world for the penitent and regretful.