In looking through the Bible, there are many stories of how God used ordinary people to fulfil His purposes and plan for the world. Every single person has a part to play in this, especially to be used in the body of the Church of Jesus Christ. Your purpose, your calling is given to each in accordance with the gift you have received from God. Finding your purpose by discovering your spiritual gift is the way you are to minister to the body of Christ, His church.
Our calling, our purpose, our ministry is something all Christians have. Just like Joshua, we will come to know our purpose as we read and meditate on the scriptures.
In the same way as Moses, our purpose will take faith. Like Jeremiah, God will make us uncomfortable until we step out to fulfill our purpose for Him. Just as Solomon, our purpose will be for people and not material things. In the same manner as Paul, our true purpose will have significance beyond this life. And, like Timothy, God has gifted us with the abilities we need to live out our purpose, all for His plan and glory.