Nature of Mind

What is the nature of mind like?
Imagine a sky, empty, spacious,
and pure from the beginning;
its essence is like this.
Imagine a sun, luminous, clear,
unobstructed, and spontaneously present;
its nature is like this.
Imagine that sun shining out impartially
on us and all things, penetrating all directions;
its energy, which is the manifestation of compassion, is like this:
Nothing can obstruct it, and it pervades everywhere.
~ Sogyal Rinpoche