Human life is a very precious and rare opportunity not always available, and the opportunity to attain realization and freedom from suffering does not occur with every lifetime, or even in each lifetime in which we have a human body. Furthermore, mere possession of a human body is not a sufficient base from which to practice dharma, because one has to have all the other appropriate conditions in order to practice. So, this lifetime is an opportunity which one may not obtain again if one does not utilize it properly at this time.
from the book Showing the Path of Liberation
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