Colossians 4:6 Let your speech be always with grace, seasoned with salt, that you may know how you ought to answer every man.
This is in the context of believers in a local assembly , not when doing the work of evangelism..Here are some scriptural guidelines for evangelistic work..
2 tim 4:
2Preach the word; be instant in season, out of season;
reprove, rebuke, exhort with all long suffering and doctrine.
3For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears;
4And they shall turn away their ears from the truth, and shall be turned unto fables.
5But watch thou in all things, endure afflictions,
do the work of an evangelist, make full proof of thy ministry.
paul when doing evangelistic work, did not always come accross with kind words..acts 13:
9Then Saul, (who also is called Paul,)
filled with the Holy Ghost, set his eyes on him.
10And said, O full of all subtilty and all mischief, thou child of the devil, thou enemy of all righteousness, wilt thou not cease to pervert the right ways of the Lord?
This was not a brother in christ paul was speaking to, because he perverted the ways of truth..The same paul who wrote col 4:6 spoke these words too..so you must not take verses out of context to fit your mode of thinking..if you want to promote pauls and christ examples, then dont be selective..but be for real..
christ in His evangelistic work, spoke harsh to false teachers too..
jn 8:
44Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
so i would appreciate it if you quit trying to make me accept folk as my brethern in the Lord, when i believe they teach and believe lies..
Thank You..