G. Campbell Morgan taught his disciples to read a book of the Bible fifty times before you ever preach it.[1]

This takes time. A large block of uninterrupted time early in the morning is usually the best. There is an excellent interview between C. J. Mahanay and Mark Dever on this necessary step. Mark Dever says that he first reads and rereads the passage that he will preach and spends about 35 hours a week in sermon preparation.