There are various powers of this Universe. Most important is light, which is all pervading and all creative. Fertilization of earth starts with photosynthesis. The second power is evolution. In this way the Universe grows, evolves and gets dynamic. Due to evolution everything renews itself. Creation of life was with light, and nurturing by evolution on earth. The third factor is time. Universe Time Scale (UTS) and time scale of our life are different. The Universal phenomena go as per UTS. Every existence of the Universe is put in its framework by time, and also terminated by it at a certain point. With the Universe integrated, it is the result of light, evolution and time (LET). Evolution is doing its work through human beings as well. One good point of human mind is its participatory nature. Human brain is an exciting organ. Secrets of Universe are being revealed through human brain and the mind which perceives the whole Cosmos and tries to solve its puzzles. Fertilization of the Universe is the law of life, for which we need human brain. Human beings therefore, have to preserve and assure blooming of life on earth.