Counsel in the heart of man - Men of the deepest and most comprehensive minds are rarely apt, unsolicited, to join in any discourse, in which they might appear even to the greatest advantage; but a man of understanding will elicit this, by questions framed for the purpose, and thus pump up the salubrious waters from the deep and capacious well. The metaphor is fine and expressive.
The contest between reticence on the one side and pertinacity in search on the other is represented as by a parable. The well may be very deep (compare the marginal reference), but the man of understanding” has enough skill to draw up the water even to the last drop. Every question is, as it were, a turning of the windlass.