Believers in Christ have been given the unbelievable, undeserved assignment of being Christ’s ambassadors on earth, representing God to desperate, confused, hopeless people, as He were entreating through us (2 Corinthians 5:20). [See also 5-10-18, as well as 2-22-18.]
But you are a chosen race, a royal priesthood, a holy nation, a people for God’s own possession, so that you may proclaim the excellencies of Him who has called you out of darkness into His marvelous light. 1 Peter 2:9
So, in our interactions with the unbelieving world, we have the important role of 1) representing God, 2) pleading with anyone who will hear to be reconciled to God through Christ, and 3) proclaiming God’s goodness and forgiveness.
Additionally, we priests have a role to play with our fellow believers, that of shepherding the flock of which we are part.
Shepherd the flock of God among you, exercising oversight not under compulsion, but voluntarily, according to the will of God; and not for sordid gain, but with eagerness; nor yet as lording it over those allotted to your charge, but proving to be examples to the flock. And when the Chief Shepherd appears, you will receive the unfading crown of glory. 1 Peter 5:2-4
Jesus, the Chief Shepherd, will reward us according to the seriousness with which we perform His assignment. O God, let us perform this task You have given to us with earnestness, realizing that we will soon give an account to You for how we have managed it.
Obey your leaders and submit to them, for they keep watch over your souls as those who will give an account. Let them do this with joy and not with grief, for this would be unprofitable for you. Hebrews 13:17