The utterance of man that brings a conviction of sin and an awareness within the heart, mind and soul of others as to their need for repentance, always has as its source, the living God above. There is never a power possessed by anyone that is able to speak horizontally with such life altering impact, except that the conversation be inspired by the Holy Spirit. Correction by mere human confrontation or by Biblical knowledge alone will fall flat to the ears of the hearer. Even the Holy Scriptures, which are alive and active, sharper than any two edged sword, lays dormant until the life of the Spirit becomes manifest to interpret it.
Is there something or someone weighing on your heart? PRAY for wisdom and ask the Holy Spirit to work within your situation. Never go at it simply possessing the truth of a matter (in as much as you think you have properly discerned it) without calling on God to work in everyone involved, especially yourself. You may have a sure mental confidence about confronting something, but if your first effort isn't prayer, you will probably just start an argument. As you seek to deny yourself of your rights or entitlements, the Holy Spirit will afford you the necessary humility needed for God's power to work through you. Otherwise, your words will be perceived as accusations and you will be defied.
Another key premise that prayer affords us is knowing whether or not you should even approach your situation at that time, or at any time. God will impress His guidance upon you if you will not move forward with your own human understanding or emotional reactions. Wait on Him. Listen and do not move until He leads you forward in peace to do so. If you feel anxious about any part of it, ask God to reveal the source of the troubling, that you may overcome this fear. Always be conscious of this: it is God who ultimately confronts His own creation.
"And they shall not teach, each one his neighbor and each one his brother, sayin, 'Know the Lord,' for they shall all know me, from the least of them to the greatest."