James 2:19 Thou believest that there is one God; thou doest well: the devils also believe, and tremble.
20 But wilt thou know, O vain man, that faith without works is dead?
Many believe that just to say you believe in God is enough, but without trust in God to act upon the faith, it becomes very questionable about whether you really have faith in God, or are just saying you do.The devils believe, because they have seen God in heaven. It takes no faith at all to believe something you have seen with your own eyes. The true faith is believing in your heart in something you have not seen. Devils here, is speaking of the angels that followed Lucifer out of heaven. They tremble, because they know the terrible fate that awaits them. A vain man is an empty man which has no faith and if we are true Christians our faith shows in our works. Those who profess faith must be like this fruitful tree. Silent Christians are not fulfilling the great commission to go into all the world and preach the gospel. It is not our obligation for them to listen, but it is our obligation to tell them, if we have faith. To have faith and do absolutely nothing about it, is no faith at all.