The following story was once told to me by Lama Tsering Everest:
You cannot
collect the milk of a snow lioness in an ordinary bucket. The milk of a
snow lioness is really extraordinary because she is a very special
kind of mythical and powerful magical being that doesn’t really exist
totally in our world and yet sometimes occur here. The milk of a snow
lioness is very, very sacred. But, even if you could get to a snow
lioness, get to her milk, you couldn’t keep it in an ordinary bucket. It
defies the molecular structure of an ordinary bucket and it would seep
right through the metal. So, they say if you want to collect the milk of
a snow lioness, you have to have a bucket made of jewels. Then you can
collect that kind of precious essence. Its the same with the dharma. If
you want to collect the precious essence of the dharma, which can open
for you the essence of your own mind and cause the conditions that can
benefit you and others, then you really have to come with a pure heart.
Not just for yourself but for everyone. And expand your mind and expand
your heart in as great a way as you can to collect the milk, that you
can taste of it and others can taste of it.