Our Thoughts Shape Our Character - Ajahn Dhammasiha
Often we mistakingly believe that thoughts are not so important, as only bodily actions and speech create heavy Karma, not mere fleeting thoughts.
But as we think, so the mind will gradually incline. If we regularly think angry thoughts, the mind will incline towards anger. If we think thoughts of loving kindness, the mind will incline towards loving kindness. The inclination forms a habit, and the habit finally becomes an ingrained charactertrait in our heart.
Thus, over time these seemingly unimportant and fleeting thoughts actually shape our character. We can gradually train ourselves to become patient, kind, generous, calm and wise, even if we're currently still show the opposite traits!