When Jesus was speaking to the woman of Samaria, as he sat by Jacob's well, he compared the blessing of his grace to the water of that well. Pointing to the well at his side, he said: "Whosoever drinketh of this water will thirst again. But whosoever drinketh of the water that I shall give him, shall never thirst; but the water that I shall give him, shall be _in him, a well of water, springing up unto everlasting life_." John iv: 13, 14. This is one of the most beautiful illustrations of the blessing Jesus gives that ever was used. It is a great blessing to have a well of clear, cold water in our garden, or near our door. But, only think of having a well of water _in our hearts_. Then, wherever we go, we carry that well with us. We never have to go away from it. No one can separate between us and the water of this well. Other wells dry up and fail. But this is a well that never dries up, and never fails. This well is deep, and its water is all the time "springing up unto everlasting life." How happy they are in whose breasts Jesus opens this well of water! Coleridge, the English poet, in writing to a young friend, just before his death, said: "Health is a great blessing; wealth, gained by honest industry, is a great blessing; it is a great blessing to have kind, faithful, loving friends and relatives, _but, the greatest, and best of all blessings is to be a Christian_." One of the most able and learned lawyers that England ever had was John Selden. He was so famous for his learning and knowledge that he is always spoken of as "the learned Selden." On his deathbed he said--"I have taken much pains to know everything that was worth knowing among men; but with all my reading and all my knowledge, nothing now remains with me to comfort me at the close of life but these precious words of St. Paul: 'This a faithful saying, and worthy of all acceptation, that Christ Jesus came into the world to save sinners;' to this I cling. In this I rest. This gives me peace, and comfort, and enables me to die happy." William Wilberforce was another of the great and good men who have been a blessing and an honor to England. When he was on his deathbed, he said to a dear friend: "Come, let us talk of heaven. Do not weep for me. I am very happy. But I never knew what happiness was till I found Christ as my Saviour. Read the Bible. Let no other book take its place. Through all my trials and perplexities, it has been my comfort. And now it comforts me, and makes me happy." Here we see "this well of water springing up unto everlasting life." And Jesus, who came to tell us of this water, and to open up this well in our breasts, may well be called, "the Great Teacher," because of the great blessings--of which he tells. _In the second place Jesus may be called "the Great Teacher" because of the_--GREAT SIMPLICITY--_of his teachings_.