Through this gentle form showed, however, the radical denial of all truth that does not come to us through sensory experience. With faith you can believe in the supernatural, with imagination you can create a transcendent world of religious and metaphysical ideas. The reason, therefore, can only know what they, under their own laws, lead the study and observation of the phenomena that come to their knowledge through the senses. This is only science: the rest is poetry, or whatever you call it. And the principle of science to D. Angelo was that there are an infinite substance, which, under agitation and inexplicable itching, which is its essence, produces a variety of beings, whose relative perfection, within the period in which we live, and as far as memory can penetrate the past, and the prudent foresight in the future, is still growing, thanks to a bottom-up process and a development that seems to us that never ends. How it began and how it will end, holding D. Angelo is ignored and will be ignored forever. He was vain, in his feeling, obstinacy to see further: if before the beginning of this development there was another, if after things return to rest and death, and then if they wake up itching and desire new atoms, which carry to band together and create another universe, and new lives, and progress, and consciousness, and what we call spirit, and finally, death again. On all this, they could only forge theories and dreams, throwing in risky speculation, beyond the terms and boundaries as far as the reason we follow.