To end suffering —not only by relieving its symptoms but eradicating its root cause— is precisely the aim of the Buddha’s teaching. We must first realize that the true cause of suffering is not outside, but inside. That is why true spiritual practice consists of working on one’s own mind.
The mind is very powerful. It can create happiness or suffering, heaven or hell. If, with the help of the Dharma, you manage to eliminate your inner poisons, nothing from outside will ever affect your happiness. But as long as those poisons remain in your mind, you will not find the happiness you seek anywhere in the world.
—Nyoshul Khen Rinpoche