A friend of mine becomes quite angry at times and will lose his temper and use inappropriate language. I find this quite frightening because my wife is not a believer. What should I do?
I’ll share some scriptures that come to mind.
Everyone has their own giants to overcome, and it sounds like one of your friend’s giants is anger. Our job is to be patient with others and love them through these difficult times. Is he repenting for his outbursts of anger and profanity? Does he seem genuinely sorrowful? If he is then you need to forgive him and do all you can to help him overcome this problem he has.
Mat 18:21 Then Peter came to Him and said, “Lord, how often shall my brother sin against me, and I forgive him? Up to seven times?”
Mat 18:22 Jesus said to him, “I do not say to you, up to seven times, but up to seventy times seven.
However, if he is not repenting or making any effort to change, then it may be best to not have him over to your house any longer, especially if his behavior is upsetting your wife.
1Co 5:11 But now I have written to you not to keep company with anyone named a brother, who is sexually immoral, or covetous, or an idolater, or a reviler, or a drunkard, or an extortioner—not even to eat with such a person.
1Co 5:12 For what have I to do with judging those also who are outside? Do you not judge those who are inside?
Pro 27:12 A prudent man foreseeth the evil, and hideth himself; but the simple pass on, and are punished.
Pro 22:5 Thorns and snares are in the way of the perverse; He who guards his soul will be far from them.
There is a time for everything, I time to forgive and be patient, and a time to put a rebellious brother away from us. I pray the Lord gives you the wisdom to know how to best handle the situation.
Here is a study about correction within the Body of Christ that may help you.
Your brother in Christ,