The purpose of life is to grow, expand, and realize one's true identity.
In the light of the sun, in the light of the moon, and in the light of the stars there is no discrimination. The light within you has the power of discrimination. You can use that light to see the darkest corners of your inner chamber. For that you do not need outer guidance. The purpose of a guide, guru, or teacher is to introduce you to that light.
To attain the purpose of life, it is necessary to do one’s duties, whether one lives in the world or outside it. The path of renunciation and the path of action, though two diverse ways, are equally helpful for attaining self-emancipation. One is the path of sacrifice, the other the path of conquest.