What is dark clings to what is light and so enhances the brightness of the latter. A luminous thing giving out light must have within itself something that perseveres; otherwise it will in time burn itself out. Everything that gives light is dependent on something to which it clings, in order that it may continue to shine.
Thus the sun and moon cling to heaven, and grain, grass, and trees cling to the earth. So too the twofold clarity of the dedicated man clings to what is right and thereby can shape the world. Human life on earth is conditioned and unfree, and when man recognises this limitation and makes himself dependent upon the harmonious and beneficent forces of the cosmos, he achieves success. The cow is the symbol of extreme docility. By cultivating in himself an attitude of compliance and voluntary dependence, man acquires clarity without sharpness and finds his place in the world.
“When you become light and you radiate, there is no darkness. A candle has one future, to spread the light. How does the candle spread the light? By burning itself, the candle spreads the light and consequently knows the future. If you burn yourself, you will radiate and will spread the light. The job of the human being is to radiate through the finite self the infinite light.” Yogi Bhajan