but the words of the pure are pleasant words.” - Proverbs 15:26.
It seems also that we need to get to mind that there is a sure relationship between our thoughts and our words. The word “thought” is the Hebrew word “mah͙s̆ĕbȏt” and is used 56 times throughout the OT and is given as “thought” 28 times, “device” 12 times, “purpose” six times, “work” three times, “imaginations” three times, and then as “cunning” once, “devised” once, “invented” once, and “means” once each. The basic idea is that of some mental construction that assigns meaning to the production of the mind.
The words “of the pure”, on the other hand, are the formation of a single Hebrew word with only 7 occurrences. It is the word “no̅ ̓am” and translates as “beauty” four times, “pleasant” twice, and “pleasantness” once.
The basic idea of the word is that of kindness, pleasantness, delightfulness, beauty, favor. And can be understood as delightfulness, here being a delight to God as He hears what we say. It is the basic thought of that which is as it ought to be and as one would “want” it to be and take pleasure in the usefulness of said thing or idea. When speaking of ones’ “words” it speaks of the communication being rightly appropriate to what is their intention, not hurtful or distressing.