Many Christian leaders today, including full-time preachers and pastors, are not really preaching the Gospel. They are stocking the Gospel. Preaching is to take the initiative to go out and talk to people about the heart of God. Storing the Gospel is waiting for people to come and ask, and then you give them. That is not preaching, that is stocking.
However, if one studies not the Word, if one has no concern of God's will, how can one truly preach the Gospel, but merely pretend to follow God's commission.
Not all are called preachers, not all are called pastors, but we must all recognize the gift and commission God bestowed upon each and everyone of us to achieve our full potential.