And let the peace (soul harmony which comes) from the Christ rule (act as umpire continually) in your hearts [deciding and settling with finality all questions that arise in your minds.... And be thankful (appreciative), [giving praise to God always.]
Colossians 3:15, The Amplified Bible
Have you been praying that God will let you know whether a certain action you want to take is agreeable to His will or not? Let this peace of Christ be your guide. Let it help you settle the issue. If you start to take that action and you realize you don't have peace about it, don't do it.
Remember, though, that this inner leading of the Holy Spirit, this subtle sense of uneasiness or peace He gives you, is something you have to watch and listen for carefully. He generally won't just come up and knock you out of bed one morning and tell you what you need to do. The primary way He speaks to you is by what the Bible calls an inward witness.
So, you have to listen. You can't just stay busy about the things of the world all the time. You have to give Him time and attention.
Also, watch out for strife. If you're irritated and upset about things in your life, it will be very hard to receive that quiet guidance from the Holy Spirit. So take heed to the instructions at the end of this scripture and "be thankful... appreciative, giving praise to God always." Maintain a thankful, grateful heart. You'll find it much easier to hear the "umpire of peace" when He makes a call.