Proverbs 20:5

Counsel in the heart of man, &c.— There is hardly any thing but may be compassed by wisdom: for though the designs and intentions of another man, especially one who has a deep understanding, are as hard to be founded as waters which lie in the secret caverns of the earth; yet there are persons of such penetration, that they will find means to discover them, and draw them out. Lord Bacon observes, that there are six ways whereby the knowledge of men may be drawn out and disclosed; by their faces and countenances, by words, by deeds, by their nature, by their ends, and by the relations of others. See Adv. of Learn. book 8: chap. 2.