5 ¶ The thoughts of the diligent tend only to plenteousness; but of every one that is hasty only to want.
Notice how diligent is contrasted as an antonym, a word having the opposite meaning of another, with hasty. Diligent is thorough in the following verses, as well;
Deuteronomy 19:18 And the judges shall make diligent inquisition: and, behold, if the witness be a false witness, and hath testified falsely against his brother;
Psalm 64:6 They search out iniquities; they accomplish a diligent search: both the inward thought of every one of them, and the heart, is deep.
So, if you want to do something diligently you won’t be hasty. There is an old saying, “haste makes waste”. This is a practical Proverb for every day life on the literal level. We say, “if something is worth doing then its worth doing right.” We also say, “we don’t have time to do it right but we will have time to do it over.” Take your time, do something thoroughly and do it right.
The way to have plenty is to be diligent, careful, and thorough. One of the many ways to poverty is to make rash decisions; to be hasty and thoughtless in business. Making decisions from the “gut” as they used to say is a good way to keep that gut empty. People who act impulsively may be fun to be around for about a minute but they are horrible examples to follow.