In plain words
For this disease, this very kind of medicine is the right medicine. Our eyes are just the same. There is a disease of the eyes as well. While the eyes are in good health, white looks white. Black looks black, red red, and yellow yellow. But once jaundice comes, everything looks yellow. Is that a fault of nature? No. No. It is a fault of the senses. As long as our tongue is healthy, sweet tastes sweet, hot tastes hot, and bitter bitter. But once malaria comes, all sweet things turn bitter. So these senses are all bound up with disease. They are not bound up with yoga. When we restrain all of them, they come to be put to good use: that itself is Patañjali's sūtra, Yogaḥ cittavṛtti nirodhakaḥ. First of all we must keep our senses under control. People must not set their senses to work by following impulse. We must teach them the calm they need. We must take time. We must examine what is lasting and what is passing. Then we must set these senses to work. Only then do we become people who have used them in the right way.
Students! At this age the senses of students are very keen and forceful. They are fierce too. Man's eyes are very … . Look at them any time and they are looking at this one and that one. Precisely through this they are increasing sin all the more. Why were the eyes given? Just to see everything. But see the good; why do you look at the bad? The mouth was given just for eating. But do you eat grass? Do you eat fruit? We must enjoy good things. So we must set every sense on the right path. At the moment we do it, we do not feel this pain at all. But later on we cannot escape experiencing its result. Keep bad sight under control. Keep bad words under control. Keep bad hearing under control. Keep bad thoughts under control. Keep bad deeds under control. This is true spirituality itself. With this very thing in view: