"If you prefer suffering or if you prefer happiness, it doesn't matter, it'll just change and then go it'll go back again. Up and down, coming and going, that's pleasure and pain in life. So after the jhana, you do the second satipatthana, you investigate this vedana, seeing it as it truly is, not as you want it to be, realising it's completely out of your control no matter how wise, skilful or powerful you are. The idea of getting just pleasant vedana and avoiding the unpleasant, you see, is a complete impossibility, it goes against nature, it cannot be done. So you give up, you let go."