Pleasure is always derived from something outside you, whereas joy arises from within. The very thing that gives you pleasure today will give you pain tomorrow, or it will leave you, so its absence will give you pain. And what is often referred to as love may be pleasurable and exciting for a while, but it is an addictive clinging, an extremely needy condition that can turn into its opposite at the flick of a switch. Many "love" relationships, after the initial euphoria has passed, actually oscillate between "love" and hate, attraction and attack. Real love doesn't make you suffer. How could it? It doesn't suddenly turn into hate, nor does real joy turn into pain.
— Eckhart Tolle