Lactantius

“ How much more are they to be judged mad and senseless, who imagine that they know natural things, which cannot be known by man! Rightly therefore did Socrates, and the Academics [1] who followed him, take away knowledge, which is not the part of a disputant, but of a diviner. It remains that there is in philosophy conjecture only; for that from which knowledge is absent, is entirely occupied by conjecture. For every one conjectures that of which he is ignorant. But they who discuss natural subjects, conjecture that they are as they discuss them. ”

“ Philosophy appears to consist of two subjects, knowledge and conjecture, and of nothing more. Knowledge cannot come from the understanding, nor be apprehended by thought; because to have knowledge in oneself as a peculiar property does not belong to man, but to God. But the nature of mortals does not receive knowledge, except that which comes from without. ”

“ Therefore we are foolish if we seek this by disputation; for some one may present himself who may deride our conjectures, and esteem us as mad, since we wish to conjecture the character of that which we do not know. But it is unnecessary to go in quest of remote cases, from which perhaps no one may come to refute us. ”