You should have very strong feelings - feelings of passion, anger - and watch them, play with them, find out the truth of them

https://jkrishnamurti.org/content/chapter-8

That is why you should have very strong feelings - feelings of passion, anger - and watch them, play with them, find out the truth of them; for if you merely suppress them, if you say, "I must not get angry, I must not feel passionate, because it is wrong", you will find that your mind is gradually being encased in an idea and thereby becomes very shallow.

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In this country, unfortunately, as all over the world, we care so little, we have no deep feeling about anything. Most of us are intellectuals - intellectuals in the superficial sense of being very clever, full of words and theories about what is right and what is wrong, about how we should think, what we should do. Mentally we are highly developed, but inwardly there is very little substance or significance; and it is this inward substance that brings about true action, which is not action according to an idea.

That is why you should have very strong feelings - feelings of passion, anger - and watch them, play with them, find out the truth of them; for if you merely suppress them, if you say, "I must not get angry, I must not feel passionate, because it is wrong", you will find that your mind is gradually being encased in an idea and thereby becomes very shallow. You may be immensely clever, you may have encyclopaedic knowledge, but, if there is not the vitality of strong and deep feeling, your comprehension is like a flower that has no perfume. It is very important for you to understand all these things while you are young, because then, when you grow up, you will be real revolutionaries - revolutionaries, not according to some ideology, theory or book, but revolutionaries in the total sense of the word, right through as integrated human beings, so that there is not a spot left in you which is contaminated by the old. Then your mind is fresh, innocent, and is therefore capable of extraordinary creativeness. But if you miss the significance of all this, your life will become very drab, for you will be overwhelmed by society, by your family, by your wife or husband, by theories, by religious or political organizations. That is why it is so urgent for you to be rightly educated - which means that you must have teachers who can help you to break through the crust of so-called civilization and be, not repetitive machines, but individuals who really have a song inside them and are therefore happy, creative human beings.

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Can strong feeling somehow misunderstood or lead pp to do drug, sex, and all kind of stuffs ?
sex is another topic and special one. [Link K talk here]