A boatman without oars, rudder and sails is carried away helplessly by the winds and currents; but a clever boatman with oars, sails and rudder, ably directs the boat in any direction he likes and reaches the other shore safely. Even so, he who knows the Laws of Nature—the law of thought, the law of Karma, the law of cause and effect—can sail fearlessly in this ocean of Samsara and reach the other shore of fearlessness and immortality quite safely. He will utilise the helping forces to his best advantage and neutralise the opposing forces skilfully, with the help of the knowledge of the Laws. Knowledge is a torch-light. Hence, knowledge is absolutely indispensable. Ignorance is the greatest sin. An ignorant man becomes a victim or a slave of nature.