All emotions are impermanent. Your happiness will not last. So enjoy it now, dance, be laugh like a fool, laugh like a sage, because one day you will be sad. And your sadness will not last, so be sad. Cry if you must. But know that you will be happy again. All things in life are subject to change, that is why it is so important to live in the now.
"You can not get out of now. And you never will!" - Alan W. Watts.
The Tao doesn’t take sides; it gives birth to both good and evil. The Master doesn’t take sides; she welcomes both saints and sinners. The Tao is like a bellows: it is empty yet infinitely capable. The more you use it, the more it produces; the more you talk of it, the less you understand - Lao Tzu