When a rainbow appears vividly in the sky, you can see its beautiful colors, yet you could not wear it as clothing, or put it on as an ornament. It arises through the conjunction of various factors, but there is nothing about it that can be grasped. Likewise, thoughts that arise in the mind have no tangible existence or intrinsic solidity. There is no logical reason why thoughts, which have no substance, should have so much power over you, nor is there any reason why you should become their slave.

Dilgo Khyentse Rinpoche
from the book The Heart of Compassion: The Thirty-seven Verses on the Practice of a Bodhisattva
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Further quotes from the book The Heart of Compassion:
- Giving and taking
- Phenomena adorn emptiness, but never corrupt it
- Conduct
- The only thing that is really worth doing
- Neither discouragement nor pride
- The reason you are wandering in samsara
- The importance of relative bodhicitta
- Powerful sources of help
- Accepting short-term sufferings
- Phenomena adorn emptiness
- Two types of friends
- Practice day and night
- Seeing clearly how deceiving the ways of the world are
- Cutting through subtler misconceptions
- Protecting ourselves from future suffering
- Just projections of the mind
- Impermanence dawning in your mind
- A practice based on your mind
- The three aspects of diligence
- Opportunity