Satan sentinels the gateway of prayer. Andrew Bonar has left it on record that he never entered into a season of pure prayer without a fierce battle at the threshold. Satan dreads nothing like prayer. He does not openly attack, he diverts. The one concern of Satan is to keep the saints from prayer. He fears nothing from prayerless studies, prayerless work, prayerless religion. He laughs at our toil, mocks at our wisdom, but trembles when we pray.