Fortunately, Solomon saw and understood this to be true and incorporated it into his Prophetic message to men here in the Book of Proverbs. He knew it to that which would fill the hearts and minds of Gods’ people with joy or happiness/fulfillment and what he here calls “honey”.
But we probably should understand it to refer to the speech characteristic of the wise of heart (Cp. vv. 21a, 23a): the wise consider their words carefully (vv. 20a, 23a) so that their words are both persuasive (vv. 21b, 23b) and good for body and soul (v. 24); they exhibit faithfulness to God (v. 20b) and are considered discerning by others (v. 21a). Such wisdom is a fountain of life, and foolish speech is empty of any such benefits (v. 22).
It seems more likely, or at least tangential in their likelihood to be referring to the pleasantness and profit of the words that are a part of Biblical preaching, study, reading, witnessing, etc. It is the taking in of God’s message and instruction that is this great pleasure to the believer.
These “pleasant word” is like “a honeycomb” to the hearer. This, of course, speaks of the place where honey is stored; either where it is made by bees, or where it is kept for further us once harvested. We can see that this is so because the word Solomon uses for “honeycomb” speaks of “honeyed words” and they words,” are they that which reflect intelligence, judiciousness, and discernment in speech. This refers to eloquent discourse from the wise (cf. v. 24). It is NOT simply speaking of words and please the ear.