Whether pleasant, unpleasant, or neutral, gross or subtle, every sensation
shares the same characteristic: it arises and passes away, arises and passes
away. It is this arising and passing that we have to experience through
practice, not just accept as truth because Buddha said so, not just accept
because intellectually it seems logical enough to us. We must experience
sensation’s nature, understand its flux, and learn not to react to it.
—S.N. Goenka,