Again, time is one of the accidents, the creation of which it is impossible to imagine, for it is necessary that the non-existence of a thing be preceded by time. But in this case it cannot be imagined that the non-existence of a thing can be preceded by itself, except by accepting time as existent. So also it is difficult to imagine the creation of the space in which the universe is, for every existent thing occupies a former space. For if it is a void, as is the opinion of those who think that the void itself is space, its creation also, if we suppose it to be created, must been have preceded by another void. And if the space be a tangible body, as is the opinion of another group, then it should be contained in another body, which would require another, and so on without limit. These are all obscure problems and the arguments which are brought to disprove the eternity of the accidents, are necessary for one who believes in the eternity of those accidents which can be perceived; that is, one who asserts that not all the accidents are created. For they say that the accidents which can be perceived by the senses are created things. If they are not created, then they will move from one place to another, or will be latent in the place in which they are to appear, before they make their appearance. Then they disprove both of these arguments, and think that they have established that all the accidents are created things. But it has become apparent from what they have said, that the apparently created portions of the accidents are created, not those whose creation is not apparent, nor those in whose case there is doubt, such as the accidents which are in the heavenly bodies, in their movement, in their shape, etc., etc. So their arguments about the creation of all accidents, can be interpreted by the analogy of the visible to the invisible. This is an exhortative argument, except in the suggestion of reasonable arguments which depend here on the certainty of the similarity of the character of the visible and the invisible.