To end suffering – not only by relieving its symptoms but by 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
from the book On the Path to Enlightenment: Heart Advice from the Great Tibetan Masters
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Further quotes from the book On the Path to Enlightenment:
- Detachment
- The alternation of thoughts
- Free Perception
- The enemies dwelling in your mind
- Right Time
- Cut the knot of greed
- Just as clouds
- Apply yourself unrelentingly to spiritual practice
- Clarity and emptiness
- Whatever you do
- Trample on anger with realization
- See the difference
- You who have a precious human life
- The four boundless qualities
- Our journey will have been useless
- Only the fool wants more pain
- Like gold hidden in its matrix
- The ultimate nature of mind
- True compassion