No doubt we often confuse intelligence with intellect, but intelligence is something which is to be found even in the lower creation. It can be traced in plant life and sensed even in the heart of the rock. The difference between modern psychology and ancient thought is that according to the former the intellect is a development which manifests in the life of man as mind, but that animals have no mind, that mind is a development of matter, the work of the brain. The idea of the mystics of all times, of the prophets and all meditative souls is different.