"Faith cometh by hearing." Therefore, to begin with, be audible. The Sermon on the Mount commences thus: "He opened His mouth" (Matt. v. 2).
Time and Eternity. Speak to men's fleeting hopes and passing interests; speak also to their grey hairs and to their midnight hours.
Ultimata. Desire to prophesy (1 Cor. xiv. 1); covet to prophesy (ib. 39); do not preach if thou darest be silent (1 Cor. ix. 16).