Isaiah 6:8 (NKJV)
When a business needs to have more people working for them they will do something to try and find new employees. In the past, companies would put ads in newspapers and sometimes place a "Help Wanted" sign in the window of their business. Today, companies list employment opportunities online, some hire other companies to help them find employees, and there are also job placement services that can help to fill employment needs. But, no matter how it happens, a company needs to find people to work for it to be able to do what they are doing. If a business had no employees it would accomplish nothing.
In Isaiah we see that God was looking for someone to go for Him and speak to the people; you could say this was God putting out a "Help Wanted" sign. This is the same thing that God is doing today because God is still looking for people who will help Him to do His will. The Bible tells us that as born again believers we are the Body of Christ, and there is no such thing as unemployment in the Body of Christ; God is looking for people to help Him carry out His will on the earth. There are things that God wants to do today that are not being done because no one has responded to Him.
God has given each of us a gift to use to serve Him and one another (1 Peter 4:10), all Christians have a supply to give to the Body of Christ (Ephesians 4:16), and God has a place for us, where He has set us, in the Body (1 Corinthians 12:18). All of us are important in the plan that God has today and we all need to see where we can help and do the will of God. Every believer needs to be ready to answer the call that God is giving to do His work. If each member of the Body of Christ would fill their position and give their supply tremendous things would be done today. God still has His "Help Wanted" sign out, how will we respond?