Then another lesson that I draw from this glad confession is--the bold avowal that always accompanies certitude. These men's stammering tongues are loosed. They have a fact to base themselves upon. They have a piece of assured knowledge inferred from the fact. They have a faith built upon the certitude of what they know. Having this, out it all comes in a gush. No man that believes with all his heart can help speaking. You silent Christians are so, because you do not more than half grasp the truth that you say you hold. 'Thy word, when shut up in my bones, was like a fire'; and it ate its way through all the dead matter that enclosed it, until at last it flamed out heaven high. Can you say, 'We know and we believe,' with unfaltering confidence? Not 'we argue'; not 'we humbly venture to think that on the whole'; not 'we are inclined rather to believe'; but 'we _know_--that Thou knowest all things, and that Thou hast come from God.' Seek for that blessed certitude of knowledge, based upon the facts of individual experience, which 'makes the tongue of the dumb sing,' and changes all the deadness of an outward profession of Christianity into a living, rejoicing power. Then, further, I draw this lesson. Take care of indolently supposing that you understand the depths of God's truth. These Apostles fancied that they had grasped the whole meaning of the Master's words, and were glad in them. They fed on them, and got something out of them; but how far they were from the true perception of their meaning! This generation abhors mystery, and demands that the deepest truths of the highest subject, which is religion, shall be so broken down into mincemeat that the 'man in the street' can understand them in the intervals of reading the newspaper. There are only too many of us who are disposed to grasp at the most superficial interpretation of Christian truth, and lazily to rest ourselves in that. A creed which has no depth in it is like a picture which has no distance. It is flat and unnatural, and self-condemned by the very fact. It is better that we should feel that the smallest word that comes from God is like some little leaf of a water plant on the surface of a pond; if you lift that you draw a whole trail after it, and nobody knows how far off and how deep down are the roots. It is better that we should feel how Infinity and Eternity press in upon us on all sides, and should take as ours the temper that recognises that till the end we are but learners, seeing 'in a glass, in a riddle,' and therefore patiently waiting for light and strenuously striving to stretch our souls to the width of the infinite truth of God. II. So, then, look, in the second place, at the sad questions and forebodings of the Master.