This sensible world […] is almost like a book written by the finger of God, that is, created by divine virtue, and individual creatures are like figures, not invented by human arbitrariness, but established by divine will to manifest the invisible wisdom of God. [...] It is therefore good to contemplate assiduously and admire divine works.
Source, in full
From Eruditio didascalica, lib. VII, De tribus diebus; quoted in Gino Ditadi, “'Introduction: The animal good to think about”', in Philosophers and animals, vol. 1, Isonomia editrice, Este, 1994, pp. 82-83. ISBN 88-85944-12-4.