"Let no unwholesome word proceed from your mouth, but only such a word as is good for edification according to the need of the moment, that it may give grace to those who hear." Ephesians 4:29

Ephesians 4:22 & 24 tell us,
"...lay aside the old self, which is being corrupted in accordance with the lusts of deceit." Vs. 22 "And put on the new self, which in the likeness of God has been created in righteousness and holiness of the truth." Vs. 24

Then Ephesians 4:25-29 tells us of some changes to be made in our new life in Christ. These verses not only tell us what must be changed from, but what it should be changed to.
Our opening verse then tells us that Believers are not only to stop saying unwholesome things, but to begin to say things that will build up others.
Let's see what Scripture tells us of this.

We are warned against unwholesome words:
"Let all bitterness, wrath, anger, clamor, and evil speaking be put away from you, with all malice." Ephesians 4:31

"...be ready for every good work, to speak evil to no one, to be peaceable, gentle, showing all humility to all men." Titus 3:1-2

"Do not speak evil of one another, brethren. He who speaks evil of a brother and judges his brother, speaks evil of the law and judges the law."
James 4:11

"Therefore, laying aside all malice, all guile, hypocrisy, envy, and all evil speaking, as newborn babes, desire the pure milk of the word."
1 Peter 2:1-2

Of wise words, we see they are--
Pleasant:
"Pleasant words are like a honeycomb,
Sweetness to the soul and health to the bones." Proverbs 16:24

Appropriate:
"A word fitly spoken is like apples of gold In settings of silver." Proverbs 25:11

Gracious:
"The words of a wise man's mouth are gracious, But the lips of a fool shall swallow him up." Ecclesiastes 10:12

Comforting:
"The Lord God has given Me
The tongue of the learned,
That I should know how to speak
A word in season to him who is weary." Isaiah 50:4

The Believers' words are for edifying (building up):
"Therefore let us pursue the things which make for peace and the things by which one may edify another." Romans 14:19

"Let each of us please his neighbor for his good, leading to edification."
Romans 15:2

The Apostle Paul speaking to the Corinthians, "...But we do all things, beloved, for your edification."
2 Corinthians 12:19

Paul tells the Ephesians the purpose of the gifts, "For the equipping of the saints for the work of ministry, for the edifying of the body of Christ." Ephesians 4:12

Our words are to give grace to the hearers:
"They shall speak of the glory of Your kingdom and talk of Your power."
Psalm 145:11

As with the two on the Emmaus road, we speak of Christ:
"Now behold, two of them were traveling that same day to a village called Emmaus, which was about seven miles from Jerusalem. And they talked together of all these things which had happened." Luke 24:13-14

Not only the words we speak, but in song as well do we speak grace to one
another:
"Let the word of Christ richly dwell within you, with all wisdom teaching and admonishing one another with psalms and hymns and spiritual songs, singing with thankfulness in your hearts to God." Colossians 3:16

And let us do just as Paul exhorted the Colossians to do in 3:17, "And whatever you do in word or deed, do all in the name of the Lord Jesus, giving thanks through Him to God the Father."

All praise, honor and glory to You most holy God! Amen