"Furthermore, when I came to Troas to preach Christ's gospel, and a door was opened to me by the Lord"  

2 Corinthians 2:12

God opened a door for Paul to minister the Gospel everywhere he went. God was opening doors for Paul, but it was Paul's choice to step through the opened door or not. God still opens doors of opportunity daily for us to minister the Gospel to others, and still just like Paul we must choose to walk through the door. God wants to use us, and will give us opportunities to share the Good News of Jesus Christ to this lost and dying world, but we must take the step of faith and do it! If you want God to use you, rejoice, you and God are in agreement! When God opens a door step through it, don't allow fear to keep you back. The more doors we step through the more doors we will notice open for us. Ask God daily to open a door of opportunity for you, enlarging your territory, that you may share your faith with someone else, and when the door is opened, don't hesitate, run through it and share the Good News you have been entrusted with!

"And Jabez called on the God of Israel saying, "Oh, that You would bless me indeed, and enlarge my territory, that Your hand would be with me, and that You would keep me from evil, that I may not cause pain!" So God granted him what he requested." 1 Chronicles 4:10