Matthew Poole and continuators on Ecclesiastes 3:9

9 What profit hath he that worketh, in that wherein he laboureth ?

Seeing then all actions and events in the world are out of mans power, and no man can at any time do or enjoy any thing at his pleasure, but only what and when God pleaseth, as hath been now shewed in many particulars, and it it as true and certain in all others, hence it follows, that all mens labours, of themselves, and without Gods help and blessing, are unprofitable, and utterly insufficient to make them happy.

Marginal references: Ch. 1. 3.