The purpose of life is to attain pleasure. A primary source of pleasure is having power through Torah and Mitzvahs. Torah makes us constantly aware of purpose and our duties in life; it gives us a true definition of our purpose, and it shows us the ways and means of attaining this goal.  G-d told Adam, the purpose in life, “Replenish the earth, and conquer it; and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moves upon the earth.”