If there weren't impatient people around us, how would we learn patience? I once asked my Grandmother, my spiritual teacher, why there should be people to scold me, criticize me, attack me. Her reply was, "How else can you learn patience?" Left to ourselves, we find it quite pleasant to say "Quiet" and prevent others from talking. People who are not used to hearing no can become insufferable. When we purify ourselves by learning to be patient, by learning to forbear, we come at last to see the Lord hidden in our own and everyone's heart.
— Eknath Easwaran, The Bhagavad Gita for Daily Living: Volume 1