"You know what love is because you've studied it, not because..." — Matthew Sharpe quote meaning

You know what love is because you've studied it, not because you've felt it. You never will. You know what love is? It's this insidious thing that infects your eyes and ears, spreads to every inch of skin, the follicles of hair on the skin, the lips, the tongue, a hundred million microscopic organisms crawling on you. They commandeer the hollow of your thorax and your guts, your arms, your legs, your head, and other extremities. You cease to be yourself. You are now a vessel of impressions and thoughts of the person you love, of wishes for her, of dreams of her. You're jealous of the air she breathes because she takes it inside her all day and needs it to live; it becomes her, as you want to. You cast your thoughts of her and you an hour, a day, a week, a year, a hundred years into the future. No thought has the power to push itself as far into the future as the thought of love—not even thoughts of fame, or wealth, or death.