That is a simple scene, reader. But it is almost certain that you, too, have been in love—perhaps, even, more than once, though you may not choose to say so to all your feminine friends. If so, you will no more think the slight words, the timid looks, the tremulous touches, by which two human souls approach each other gradually, like two little quivering rain-streams, before they mingle into one—you will no more think these things trivial than you will think the first-detected signs of coming spring trivial, though they be but a faint indescribable something in the air and in the song of the birds, and the tiniest perceptible budding on the hedge-row branches. Those slight words and looks and touches are part of the soul's language; and the finest language, I believe, is chiefly made up of unimposing words, such as "light," "sound," "stars," "music"—words really not worth looking at, or hearing, in themselves, any more than "chips" or "sawdust." It is only that they happen to be the signs of something unspeakably great and beautiful. (50.47)
Love is "unspeakably great and beautiful," but it is not impossible to explain or comprehend. Thank heavens, because how else could we explain Valentine's Day? Small moments of affection can provide access to the sublime power of love. Now there's a sentiment that belongs on a card!