Yet I believe that, through our ideas of them, we should decide nothing concerning the number of kinds of beings God has created, since, speaking absolutely, it is possible that God has reasons we do not know for concealing them from us even if it were only for the reason that since these beings have no relation to us, knowing them would be of no use to us, just as He did not give us eyes strong enough to count the teeth of a gnat, because our having such sharp vision would be useless for the preservation of our body.