Matthew Poole and continuators on Ecclesiastes 10:2

2 A wise man's heart is at his right hand ; but a fools heart is at his left .

i. e. His understanding or wisdom.

Is always present with him and ready to direct him in all his actions. He manageth all his affairs prudently and piously. He mentions the right hand because that is the chief and most common instrument of actions, which by most men are done with more strength and expedition and orderliness and comeliness by their right hand than by their left.

His understanding and knowledge serves him onely for idle speculation and vain Ostentation, but is not at all useful or effectual to govern his affections and actions. He acts prepo[illegible: 1+ letters]erously and foolishly, like one without Heart, as it follows.