Rain water is pure. When you place a vessel while it is raining,
you can collect pure water. It is like distilled water. By
drinking that water, you will not be troubled by any ailment.
When the same water is mixed up with other substances, it gets
polluted. In the same manner, the mind is always pure. It
gets polluted by desires. Hence, do not pollute your mind
by cultivating desires. When a desire arises in your mind, brush
it aside to keep your mind free from pollution. You read your
text books and acquire knowledge, similarly, it is your duty to keep
your mind always pure and free from pollution. This is most
important learning you must acquire today.
-Divine Discourse, 22nd Nov 2009.