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by which knowledge can be had. The fifth rule asks about quantity and has two species. The first is when it is asked about continuous quantity, as when it is said: How great is the intellect? It must be answered that it is as great as it can be through spiritual quantity, but it is not great in a point-like or linear sense. The second species is when it is asked about discrete quantity, as when it is said: How great is the intellect? It must be answered that it is as great as the number of its correlatives in which its essence is diffused and supported, namely: the intellective, the intelligible, and the act of understanding, with which it is theoretical and practical, general and particular. The sixth rule is about quality and has two species. The first is when it is asked what the proper and primary quality of the intellect is. It must be answered that it is intelligibility, with which it is habituated. However, extrinsic understanding is a secondary and more remote property, with which the intellect itself understands a man or a lion, and so forth. From this, the intrinsic and substantial understanding of the intellect itself is habituated. And similarly concerning the extrinsic intelligible. The second species is when it is asked what the appropriated quality of the intellect itself is. It must be answered that it is to believe, to doubt, or to suppose. For these acts do not belong to the intellect properly, but understanding does.