why created by Krishna?

The living entities are not as great as Narayan, Vishnu, Who is beyond the Creation of this material world. This is accepted even by Sankaracharya-that Narayan is beyond this material Creation. So neither Vishnu nor the living entity are of the material Creation. Somebody may then enquire: Why were such small particles of the spirit created at all? The answer is that the completeness of perfection of the Supreme Absolute Truth is possible when He is both infinite and infinitesimal. If He is simply infinite and He is not infinitesimal, then He is not perfect. The infinite portion is the Vishnu Tattwa, or the Supreme Absolute Personality of Godhead; and the infinitesimal portion is the living entity.    (More...)

By the infinite desires of the Supreme Personality of Godhead there is the existence of the Spiritual World, and by the infinitesimal desires of the living entities there is this material world. When the infinitesimal living entities are engaged in their infinitesimal desires for material enjoyment, they are called Jiva Shakti; but when they are dove-tailed with the infinite, they are called liberated souls. There is no question, therefore, as to why God created the infinitesimal portions. It is the complementary and supplementary side of the Supreme. It is essential, without any doubt, that the infinite must have the infinitesimal portions. They are inseparable parts and parcels of the Soul.    (More...)