Especial preparation of this kind is necessary for the prosecution of great enterprises. We are reminded of this if we observe what followed the all-night of prayer of the Lord Jesus,--how, when it was day, He called unto Him His twelve apostles, and with them went down into the plain to heal diseases and them that were vexed with unclean spirits. Napoleon leaves his army, as they near the Russian frontier, and spurs his horse until at last in solitary contemplation he sees before him the river that separates him from the country that he is going to invade: a striking picture, made more so by the thought of the luckless termination of the enterprise. And some of us, whom God will call to great enterprises for Him that will not end in failure, will know what it is to make a similar solitary advance; and in silent waiting upon God to watch Him unroll before us the map of our journey, telling us what we must do and what we must suffer for Him: and the silence makes us strong when the voice of God has broken in upon it. And we will not marvel if to us, as to Saul of Tarsus, the answer to the question, "What wilt thou have me to do?" should come in the form, "I will shew him how great things he must suffer"; for our thoughts will turn again to Him who said, "Rise and let us be going" from the solitude of the upper room to the deeper retirement of the olive grove; who went a little farther, even from those He loved most, as He prayed, "Not My will but Thine be done"; and then took His way alone, and yet not alone, to be the Redeemer and Reviver of the souls of men. XII TESTS OF FAITH, LOVE, AND RIGHTNESS What are the experimental bases of our Christianity? and whereby shall we know that we are of the truth and assure our hearts before Him? Our answers to such questions may appear discouraging, but it is far better that we should experience discouragement (not that we would really wish to say a word to throw back the weakest believer from his faith), than that we should attempt to fill ourselves with the formulas that the Pharisees do eat. Some time ago, in discussing the definite points and peculiar characteristics of Christian life and experiences, we took as a comparison the changes of state in a material body, from solid to liquid, and from liquid to gaseous. We observed that, just as in nature the most important practical and theoretical investigations were made upon bodies in the neighbourhood of those points where they undergo a change of state, so it is also true in the world of grace that our most valuable observations and inquiries relate to certain critical points in the life--as conversion and sanctification; points which may sometimes, like the freezing and boiling points of a material substance, approach almost, if not quite, to coincidence, but which, like them, may be very widely separated.