The old Greeks used to preach, 'Know thyself.' It was a high behest, and very often a very vain-glorious one. A man's best means of knowing what he is, is to take stock of what he does. If you will put your conduct through the sieve, you will come to a pretty good understanding of your character. 'He that hath no rule over his own spirit is like a city broken down, without walls,' into which all enemies can leap unhindered, and out from which all things that will may pass. Do you set guards at the gates and watch yourselves with all carefulness. Then, again, I would say we must try to diminish as much as possible the mere instinctive and habitual and mechanical part of our lives, and to bring, as far as we can, every action under the conscious dominion of principle. The less we live by impulse, and the more we live by intelligent reflection, the better it will be for us. The more we can get habit on the side of goodness, the better; but the more we break up our habits, and make each individual action the result of a special volition of the spirit guided by reason and conscience, the better for us all. Then, again, I would say, set yourselves to educate your consciences. They need that. One of the surest ways of making conscience more sensitive is always to consult it and always to obey it. If you neglect it, and let it prophesy to the wind, it will stop speaking before long. Herod could not get a word out of Christ when he 'asked Him many questions' because for years he had not cared to hear His voice. And conscience, like the Lord of conscience, will hold its peace after men have neglected its speech. You can pull the clapper out of the bell upon the rock, and then, though the waves may dash, there will not be a sound, and the vessel will drive straight on to the black teeth that are waiting for it. Educate your conscience by obeying it, and by getting into the habit of bringing everything to its bar. And, still further, compare yourselves constantly with your model. Do as the art students do in a gallery, take your poor daub right into the presence of the masterpiece, and go over it line by line and tint by tint. Get near Jesus Christ that you may learn your duty from Him, and you will find out many of the secret sins. And, lastly, let us ask God to cleanse us. My text, as translated in the Revised Version, says, '_Clear_ Thou me from secret faults.' And there is present in that word, if not exclusively, at least predominantly, the idea of a judicial acquittal, so that the thought of the first clause of this verse seems rather to be that of pronouncing guiltless, or forgiving, than that of delivering from the power of. But both, no doubt, are included in the idea, as both, in fact, come from the same source and in response to the same cry. And so we may be sure that, though our eye does not go down into the dark depths, God's eye goes, and that where He looks He looks to pardon, if we come to Him through Jesus Christ our Lord.