I think God knows we are not yet perfect and sometimes when we fall to the flesh in anger we will say things we regret later and for that we need to repent. Anger is an ugly spirit and very hard to control at times, but that doesn't mean we lose our salvation every time we cuss, but that we need to ask forgiveness when we do.
Pro 4:24 Put away from thee a froward mouth, and perverse lips put far from thee.
Eph 5:1 Be ye therefore followers of God, as dear children;
Eph 5:2 And walk in love, as Christ also hath loved us, and hath given himself for us an offering and a sacrifice to God for a sweetsmelling savour.
Eph 5:3 But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becometh saints;
Eph 5:4 Neither filthiness, nor foolish talking, nor jesting, which are not convenient: but rather giving of thanks.
Eph 5:5 For this ye know, that no whoremonger, nor unclean person, nor covetous man, who is an idolater, hath any inheritance in the kingdom of Christ and of God.
Eph 5:6 Let no man deceive you with vain words: for because of these things cometh the wrath of God upon the children of disobedience.
Eph 5:7 Be not ye therefore partakers with them.
Col 3:8 But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth.
Jas 3:6 And the tongue is a fire, a world of iniquity: so is the tongue among our members, that it defileth the whole body, and setteth on fire the course of nature; and it is set on fire of hell.
Jas 3:7 For every kind of beasts, and of birds, and of serpents, and of things in the sea, is tamed, and hath been tamed of mankind:
Jas 3:8 But the tongue can no man tame; it is an unruly evil, full of deadly poison.
Jas 3:9 Therewith bless we God, even the Father; and therewith curse we men, which are made after the similitude of God.
Jas 3:10 Out of the same mouth proceedeth blessing and cursing. My brethren, these things ought not so to be.
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