And I set my mind to know [practical] wisdom and to discern [the character of] madness and folly [in which men seem to find satisfaction]; I realized that this too is a futile grasping and chasing after the wind.

“So everyone who hears these words of Mine and acts on them, will be like a wise man [a far-sighted, practical, and sensible man] who built his house on the rock.

if service, in the act of serving; or he who teaches, in the act of teaching;

which He lavished on us. In all wisdom and understanding [with practical insight]