In Numbers 4 Aaron is to assign each one his special task to carry out to move the tent of meeting.
In the New Testament, Paul speaks about us each having our own tasks to carry out.
I planted, Apollos watered, but God was causing the growth (1 Cor. 3:6).
Like those all working together to fulfill the purpose of moving the Tent of Meeting, Christians work together toward one purpose. All our different roles work toward the same end.
What purpose? Paul says our individual ministries work together to build up the body of Christ to maturity.
And he gave the apostles, the prophets, the evangelists, the shepherds and teachers, to equip the saints for the work of ministry, for building up the body of Christ, until we all attain to the unity of the faith and of the knowledge of the Son of God, to mature manhood, to the measure of the stature of the fullness of Christ (Ephesians 4:11-13)
Here’s a passage from Romans.
For just as each of us has one body with many members, and these members do not all have the same function, so in Christ we, though many, form one body, and each member belongs to all the others. We have different gifts, according to the grace given to each of us (Romans 12:4-6).
We are one body and each has a role. Some have a heart for children, some for the elderly, some for missions, some for teaching, some for being a helper and doing the unnoticed tasks.
Let each fulfill his task that he was assigned. Someone not wanting to get involved in the thing your heart is passionate about isn’t a sign of un-Christlikeness; it’s a sign of someone who knows the task they’ve been given and are committed to seeing it completed.
We are for each other. We are co-workers together and co-workers of Christ. It’s His will and calling to one complete, mature body in Christ that we all work towards.
It’s God’s eternal glory we’re after.