One of the main instructions given to the leaders of the church was to be able to teach. Leaders are also commanded to equip the saints so that they can also carry out the work of the minsitry, and this exactly what our teachers desire to do. 

Coming to our services should be a time of worship and fellowship, but also of mental strengthening as we grow in Christ together. Sermons are understandable but yet stimulating to the mind with respect to accurate doctrine and implication.