A basic definition of communication involves making things common. When we speak to others, we express what is in our minds and hearts making those thoughts common with others. The Bible warns the believer in Ephesians 4:29 to “Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.” The words that come out of our mouths should edify or build up others, not demean and degrade them. They should be strengthened by what we say. Keep in mind that corrupt communications weaken the believer (1 Corinthians 15:33). This is why Christians are instructed to put off all “filthy communication” (Colossians 3:8).
The opening words of our passage express a desperate warning that is increasingly neglected today. The Devil has convinced many Christians that the content of their daily conversations has no bearing on their spiritual walk. The Bible, however, speaks to the contrary. In fact, the Lord sounded the warning “be not deceived.” Why? Because quite simply: evil communications corrupt good manners! Christians who desire to serve the Lord and please Him easily can be derailed by choosing to surround themselves with those using evil communications. It is very important to speak righteous things and surround ourselves with those who carry themselves in a Christlike manner.
Many things have changed since Old Testament times. For instance, the Lord visited His people in the temple or tabernacle in the Old Testament by dwelling between the cherubims on the ark of God (Psalm 80:1). This ended especially with the onset of the New Testament and the permanent indwelling of God's Spirit within believers. The Lord stressed, “. . . that ye are the temple of God, and that the Spirit of God dwelleth in you” (1 Corinthians 3:16). For this reason, the New Testament does not place as much emphasis on reverence in the physical house of God. Regardless, the Lord is not silent concerning our behaviour in His house. We should behave ourselves both respectfully and properly (1 Timothy 3:15). Of all people, Bible believers should demonstrate reverence in the house of God so that others get a sense for our awe of God and His goodness.