2 Corinthians 2:12 (NKJV)
Opportunities are like doors, they give us access into places that we were previously not able to enter into. But, just like every time you see an open door you know it does not mean that you are supposed to enter in, every opportunity that we find is not necessarily a good opportunity. There are different kinds of doors just as there are different kinds of opportunities. Some doors look very different from others and if we are not careful we may mistake a door for something else. If we pass up a door or miss an opportunity we could lose out on something very important.
In 2 Corinthians 2:12 Paul said a door had been opened for him to preach the Gospel. In Colossians 4:3 he asked the people of Colosse to pray for him to have an open door to be able to speak the Word of God as he should. Paul knew that God was the only One who could open some doors and bring him the opportunities he needed to do what God had called him to do. But, just because a door opens it does not mean that everything is going to work out perfectly for us. As Paul said in 1 Corinthians 16:9, a door of opportunity had opened to him but there were some adversaries.
God will open doors and bring us opportunities that no man ever could. But, do we always recognize those opportunities? And, when a door opens, are we ready and able to go through that door? God could have given Paul many opportunities to preach, but if Paul had not recognized or taken advantage of them nothing would have happened. If Paul had not properly prepared himself he would not have been ready to preach the Gospel or he may not had been able to deal with the adversaries that opposed him. God will bring us the opportunities we need to do His will, but it is up to us to recognize them and step through the doors that He opens for us.