Let me counsel every true servant of Christ to “examine his own heart” frequently and carefully as to his state before God. This is a practice which is useful at all times: it is especially desirable at the present day. When the great plague of London was at its height people [noticed] the least symptoms that appeared on their bodies in a way that they never remarked them before. A spot here, or a spot there, which in time of health men thought nothing of, received close attention when the plague was decimating families, and striking down one after another! So it ought to be with ourselves, in the times in which we live. We ought to watch our hearts with double watchfulness. We ought to give more time to meditation, self-examination, and reflection. It is a hurrying, bustling age: if we would be kept from falling, we must make time for being frequently alone with God.
J. C. Ryle (1816-1900)