I believe everything is circumstantial. The circumstances in which Isaiah was a prophet are different from those in the world of work today; however, we can still spread God's truth and His ability to atone for our sins. This is a constant problem in my life, I don't think I'm capable or worthy enough to do the things God wants me to do. Then I let these thoughts consume me and prevent me from following God's will. I don't think these are the only objections we can raise. We may raise the objection that we might seem strange or judgmental if we talk to people about Christ or our Bible. We can also say that things are too hard to do, like doing the right thing every day. When it comes to God equipping us as He did Isaiah, I believe He fully does so. He told Isaiah what to say to the people in chapter six. I believe He tells us exactly what to say to people if we take the time to seek the answers and follow His will. The Bible is full of good advice and lessons to follow and follow. This can help us when it comes to dealing with people we meet at work or on the street. The ability to do this is God working in us and it is all His power, not ours