2 And, again, how could her Enthymesis, going forth [from her] along with the passion, have become a separate existence? For Enthymesis (thought) is understood in connection with some person, and can never have an isolated existence by itself. For a bad Enthymesis is destroyed and absorbed by a good one, even as a state of disease is by health. What, then, was the sort of Enthymesis which preceded that of passion? [It was this]: to investigate the [nature of] the Father, and to consider His greatness. But what did she afterwards become persuaded of, and so was restored to health? [This, viz.], that the Father is incomprehensible, and that He is past finding out. It was not, then, a proper feeling that she wished to know the Father, and on this account she became passible; but when she became persuaded that He is unsearchable, she was restored to health. And even Nous himself, who was inquiring into the [nature of] the Father, ceased, according to them, to continue his researches, on learning that the Father is incomprehensible.
Source: Adversus haereses (New Advent)