Every prudent man dealeth with knowledge: but a fool layeth open his folly.
Every prudent (man) dealeth with knowledge - acteth with judgment, not inconsiderately.
But a fool layeth open his folly - betrayeth it by setting about his business rashly, without knowledge or counsel, or regard to the place, the time, or the persons with whom he has to do; whereas the "prudent man" does not say or do all things at once and together, and in all places, but prudently has regard to what is suitable to the place, the time, and the persons (T. Cartwright).