The most crucial prerequisite for the practise of dharma is complete isolation because when we are alone, we are subject to fewer distractions, creating the perfect conditions for sadness to grow in our minds.
For those who know how to use it, sadness is a fertile ground from which all kinds of beneficial thoughts can spring with very little effort.
Jigme Lingpa described sadness as one of the most invaluable kinds of noble wealth, and in the sutras Buddha hailed sadness as the trailblazer for all subsequent good qualities.
With sadness comes trust and devotion, which, once developed, mean the practises of shamatha and vipashyana require very little effort. Shamatha practise ensures that mind becomes malleable and workable, and a flexible mind makes vipashyana relatively easy to accomplish.

Dzongsar Khyentse Rinpoche
from the book Not for Happiness: A Guide to the So-Called Preliminary Practices
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Further quotes from the book Not for Happiness:
- Without the personal advice of Buddha
- Everything we experience is a product of mind
- For the sake of all other beings
- Spiritual practice is like riding a bicycle
- Dawn of wisdom
- Practise whichever method works for you
- Our most important companion
- Right intention
- The merit of maintaining mindfulness
- Obstacles Create Fertile Ground for Practice
- Wealth is contentment
- To reject your aggression is a weakness
- Where does low self-esteem come from
- Dealing with Emotions
- Adapting the Dharma
- Altruism bolsters self-confidence
- As they truly are
- The signs of progress
- Just space
- Life is a stream of sensory illusions