Diligence has three aspects. The first, called armor-like diligence, is to develop a joyous courage and fortitude which you wear like armor against discouragement. The second is diligence in action, which is to set about accumulating merit through the practice of the six paramitas without delay or procrastination. The third is diligence that cannot be stopped, an insatiable and unremitting energy to work for the sake of others. Diligence should permeate the practice of the other paramitas, and invigorate them all.

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:
- The importance of relative bodhicitta
- Conduct
- The children of the buddhas
- Giving and taking
- Seeing clearly how deceiving the ways of the world are
- The best opportunity to put the teachings into practice
- Neither discouragement nor pride
- Powerful sources of help
- Two types of friends
- The reason you are wandering in samsara
- Phenomena adorn emptiness
- Nothing to be grasped
- A practice based on your mind
- Opportunity
- Phenomena adorn emptiness, but never corrupt it
- Just projections of the mind
- Impermanence dawning in your mind
- The only thing that is really worth doing
- The magnifying glass of your faith and devotion