God, who is complete, cannot be formless. Everything in His creation has form, so how can God have no form? This would mean that God is less than His creation—or in other words, that the complete is incomplete, which is simply illogical.
The complete whole must contain everything within our experience and beyond our experience; otherwise He cannot be complete. In addition, all the great scriptures of the world instruct us to love God. How can we love something formless or void? It’s impossible.
We're all persons, and we desire to love other persons—not some dark oblivion in outer space. We desire personal relationships, and the ultimate relationship is with the Supreme Personality of Godhead.
(Excerpted from The Form of God: Fact or Fancy?)