A man will not roll in the snow for a stream of tendency by which all things fulfill the law of their being. He will not go without food in the name of something, not ourselves, that makes for righteousness. He will do things like this, or pretty nearly like this, under quite a different impulse. He will do these things when he is in love.
The disadvantage of men not knowing the past is that they do not know the present. History is a hill or high point of vantage, from which alone men see the town in which they live or the age in which they are living.
The point is not that this world is too sad to love or too glad not to love; the point is that when you do love a thing, its gladness is a reason for loving it, and its sadness a reason for loving it more.