Karma is the cause of rebirth; and each birth is, in turn, followed by death. There the cycle of enjoyment and suffering results. Some are happy; some are not happy. So, “as you think, so you become.” Ignorance of the law is no excuse, mind that.
Sant Kirpal Singh
…whatever a man sows, that he will also reap. (Galatians 6:7)
Each thought, each word and each deed has to be accounted and compensated for in Nature. Every cause has an effect and every action brings about a reaction. Uproot the cause and the effect disappears. This has been done by the Masters who have transcended these laws, but all others are bound by the bonds of Karma, which is the root-cause of physical existence and the clever device of Nature to maintain this existence. The law of Karma sees to it that we are paid an eye for an eye, and a tooth for a tooth, in the shape of joy or suffering. It is the goading whip in the hidden hands of Nature.
The mind contracts Karma, puts a covering on the soul and rules the body through the organs and the senses. Although it is the soul that imparts strength to the mind, the latter has assumed sovereignty and is governing the soul instead. Control of the mind, therefore, is the first step to Spirituality. Victory over the mind is victory over the world. Even accomplished Yogis and Mystics who can transcend to high spiritual realms are not left untouched by the hand of Karma.More
Literature: Sant Kirpal Singh, The Wheel of Life: The Law of Action and Reaction. 1st Ed. 1965.