Hayagrīva: He believed that the soul is eternal and incorporeal in men, animals, and even in plants, and in this he differed from other philosophers of the time.
Prabhupāda: What... In which way differs? Because he accepts...
Hayagrīva: Accepted in..., the soul living in animals and also in plants.
Prabhupāda: Yes. That is the fact. He is right. That is Vedic conclusion. Sarva-yoniṣu, all different forms of life, there is soul, part and parcel of God. How some foolish person can think of animal has no soul? What is the reason? There is no very strong argument. The animals may be less intelligent. A child may be less intelligent than the father; that does not mean there is no soul. This gross and doggish mentality, animal mentality, is killing the human civilization. Now they have degraded so much that they think that the embryo has no soul. In this way man is being put into darker and darkest region of ignorance. Everyone has soul. That is real. We get it from Kṛṣṇa: sarva-yoniṣu. In different forms of life the soul is there, undoubtedly. That is real conception of soul. Evolution means he is evolving from one lower grade of body to another, higher grade of body, and in this way by evolution he comes to the human form of life. And in this human form of life he can understand the teachings of Bhagavad-gītā, that if he likes, he can surrender to the Supreme Lord and go back to home, back to Godhead, and if he does not, then he remains in this material world, undergoing the tribulations of the repetition of birth, death, old age, and disease. Corporal body.