The priest ... performed the ceremony which commemorated the smiting of the rock in the wilderness. That rock was a symbol of Him who by His death would cause living streams of salvation to flow to all who are athirst. Christ’s words were the water of life. There in the presence of the assembled multitude He set Himself apart to be smitten, that the water of life might flow to the world. In smiting Christ, Satan thought to destroy the Prince of life; but from the smitten rock there flowed living water. As Jesus thus spoke to the people, their hearts thrilled with a strange awe, and many were ready to exclaim, with the woman of Samaria, “Give me this water, that I thirst not” (John 4:15).
Jesus knew the wants of the soul. Pomp, riches, and honor cannot satisfy the heart. “If any man thirst, let him come unto me.” The rich, the poor, the high, the low, are alike welcome. He promises to relieve the burdened mind, to comfort the sorrowing, and to give hope to the despondent. Many of those who heard Jesus were mourners over disappointed hopes, many were nourishing a secret grief, many were seeking to satisfy their restless longing with the things of the world and the praise of men; but when all was gained, they found that they had toiled only to reach a broken cistern, from which they could not quench their thirst. Amid the glitter of the joyous scene they stood, dissatisfied and sad. That sudden cry, “If any man thirst,” startled them from their sorrowful meditation, and as they listened to the words that followed, their minds kindled with a new hope. The Holy Spirit presented the symbol before them until they saw in it the offer of the priceless gift of salvation.
The cry of Christ to the thirsty soul is still going forth, and it appeals to us with even greater power than to those who heard it in the temple on the last day of the feast. The fountain is open for all. The weary and exhausted ones are offered the refreshing draught of eternal life. Jesus is still crying, “If any man thirst, let him come unto me, and drink.” “Let him that is athirst come. And whosoever will, let him take the water of life freely” (Revelation 22:17). “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 into everlasting life” (John 4:14).—The Desire of Ages, 454. RC 18
When you have thus made God’s service your first interest, you may ask with confidence that your own needs may be supplied. Pr 295
"In the last day, that great day of the feast, Jesus stood and cried, saying, If any man thirst, let him come unto me, and drink. He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water." John 7:37-38 (King James Version)