Why, see what accumulated force there is in prayer, when one after another pours out his vehement desires; when many seem to be tugging at the rope; when many seem to be knocking mercy’s gate; when the mighty cries of many burning hearts come up to heaven. When, my beloved, you go and shake the very gates thereof with the powerful battering-ram of a holy vehemence, and sacred importunity, then is it that the kingdom of heaven suffereth violence. When first one, and then another, and yet another, throws his whole soul into the prayer, the kingdom of heaven is conquered and the victory becomes great indeed.
C.H. Spurgeon