Whenever we are harmed by sentient beings or anything else, if we make a habit out of perceiving only the suffering, then when even the smallest problem comes up, it will cause enormous anguish in our mind.This is because the nature of any perception or idea, be it happiness or sorrow, is to grow stronger and stronger the more we become accustomed to it. So as the strength of this pattern gradually builds up, before long we’ll find that just about everything we perceive becomes a cause for actually attracting unhappiness towards us, and happiness will never get a chance.