“We should always be aware of the relative gravity of karmic actions. When the deed is motivated by very strong delusion, the deed is said to be very grave. The way in which the deed is actually performed also determines the karmic weight.
A single moment of anger directed toward a Boddhisattva would destroy all the virtuous collections that you may have accumulated over the last thousand EONS!
The result of an action can ripen within this lifetime or within the next lifetime or after many lives.”
HH Dalai Lama THE WAY TO FREEDOM
