By these; by these wise men, and their words or writings, of which he spoke in the foregoing verse.
Be admonished; take your instructions from them, for their words are right and true, as he said, Ecc_12:10, whereas the words of other men are false, or at best doubtful.
Of making many books there is no end; I could easily write many books and large volumes upon these matters, but that were an endless and needless work, seeing things necessary to be known and done lie in a little compass, as he informs us in the next verse.
Much study; the reading of many books written by learned philosophers about these things; which it is more than probable were then extant, though since lost, which also Solomon, being so curious and inquisitive a person, would in all likelihood procure anti peruse as far as he hail opportunity.
Is a weariness to the flesh; it wasteth a man’s strength and spirits, and yet (which is implied) doth not satisfy the mind, nor sufficiently recompense the trouble and inconvenience to which man is exposed by it.