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 children of the buddhas
- Opportunity
- The magnifying glass of your faith and devotion
- I like suffering
- The best opportunity to put the teachings into practice
- Meaningless activities without end
- Nothing to be grasped
- No greater obstacle to Dharma practice
- Start observing your mind
- Before it is too late
- Never stop thinking about how to gain liberation
- Sealing your merit with authentic dedication
- No more than an empty echo
- Phenomena adorn emptiness, but never corrupt it
- Giving and taking
- Conduct
- The only thing that is really worth doing
- The reason you are wandering in samsara
- Neither discouragement nor pride