The salutations given by one saint to another are to be given through prayer having both the word of God and the will of God in mind.
Paul’s salutation was so important to him that although he did not personally pen most of his epistles, he personally penned his salutation.
False teachers are extremely dangerous because they undermine truth! Their rotten fruit may not surface for some time, but when allowed to continue unchecked, they will deceive individuals, whole families, and good churches. Paul warned Titus that such teachers had already seen some success and that their mouths must be stopped. Regretfully, whole houses had already been subverted with the false teachers still at work. A similar situation is recorded in Acts 15:24 where the saints of God were “troubled” by the words of false teachers. There is no telling how many of God’s people have walked away from sound doctrine because of false teachers. Worse yet, how many souls are burning right now in hell because they trusted in a false gospel?