Job had but one answer to make to these questions: man cannot comprehend Divine wisdom, whether it reveal itself in inanimate and brute nature or in relation to human beings. "But," continued Job, "to prove to you that I am in my right mind, listen to the question I shall put to you. Solid food and liquids combine inside of man, and they separate again when they leave his body. Who effects the separation?" And when Bildad conceded that he could not answer the question, Job said, "If thou canst not comprehend the changes in thy body, how canst thou hope to comprehend the movements of the planets?"