These verses show us, for one thing, how useless is knowledge in religion, if it is not accompanied by grace in the heart. We are told that some of our Lord’s hearers knew clearly where Christ was to be born. They referred to Scripture, like men familiar with its contents. “Hath not the Scripture said that Christ comes of the seed of David, and out of the town of Bethlehem, where David was?” And yet the eyes of their understanding were not enlightened. Their own Messiah stood before them, and they neither received, nor believed, nor obeyed Him.

A certain degree of religious knowledge, beyond doubt, is of vast importance. Ignorance is certainly not the mother of true devotion, and helps nobody toward heaven. An “unknown God” can never be the object of a reasonable worship. Happy indeed would it be for Christians if they all knew the Scriptures as well as the Jews seem to have done when our Lord was on earth!

It has been said that there are some passages in Scripture which deserve to be printed in letters of gold. Of such passages the verses before us form one. They contain one of those wide, full, free invitations to mankind, which make the Gospel of Christ so eminently the “good news of God.” Let us see of what it consists.

We have, first, in these verses, a case supposed. The Lord Jesus says, “If any man thirst.” These words no doubt were meant to have a spiritual meaning. The thirst before us is of a purely spiritual kind. It means anxiety of soul,–conviction of sin,–desire of pardon,–longing after peace of conscience. When a man feels his sins, and wants forgiveness–is deeply sensible of his soul’s need, and earnestly desires help and relief–then he is in that state of mind which our Lord had in view, when he said, “If any man thirst.” The Jews who heard Peter preach on the day of Pentecost, and were “pricked in their hearts,”–the Philippian jailer who cried to Paul and Silas, “What must I do to be saved?” are both examples of what the expression means. In both cases there was “thirst.”

We see in these verses, the obstinate blindness of the unbelieving Jews. We find them defending their denial of our Lord’s Messiahship, by saying, “We know this man whence He is: but when Christ cometh no man knoweth whence He is.” And yet in both these assertions they were wrong!

They were wrong in saying that they “knew whence our Lord came.” They meant no doubt to say that He was born at Nazareth, and belonged to Nazareth, and was therefore a Galilean. Yet the fact was, that our Lord was born at Bethlehem, that He belonged legally to the tribe of Judah, and that His mother and Joseph were of the house and lineage of David. It is incredible to suppose that the Jews could not have found this out, if they had honestly searched and inquired. It is notorious that pedigrees, genealogies, and family histories were most carefully kept by the Jewish nation. Their ignorance was without excuse.

We learn first in this passage, that honest obedience to God’s will is one way to obtain clear spiritual knowledge. Our Lord says, “If any man will do His will, he shall know of the doctrine, whether it be of God, or whether I speak of myself.”

The difficulty of finding out “what is truth” in religion is a common subject of complaint among men. They point to the many differences which prevail among Christians on matters of doctrine, and profess to be unable to decide who is right. In thousands of cases this professed inability to find out truth becomes an excuse for living without any religion at all.

The chapter we now begin is divided from the preceding one by a wide interval of time. The many miracles which our Lord wrought, while He “walked in Galilee,” are passed over by John in comparative silence. The events which he was specially inspired to record are those which took place in or near Jerusalem.

We should observe in this passage the desperate hardness and unbelief of human nature. We are told that even our Lord’s “brethren did not believe in Him.” Holy and harmless and blameless as He was in life, some of his nearest relatives, according to the flesh, did not receive Him as the Messiah. It was bad enough that His own people, “the Jews, sought to kill Him.” But it was even worse that “His brethren did not believe.”

That great Scriptural doctrine, man’s need of preventing and converting grace, stands out here, as if written with a sunbeam. It becomes all who question that doctrine to look at this passage and consider. Let them observe that seeing Christ’s miracles, hearing Christ’s teaching, living in Christ’s own company, were not enough to make men believers. The mere possession of spiritual privileges never yet made any one a Christian. All is useless without the effectual and applying work of God the Holy Ghost. No wonder that our Lord said in another place, “No man can come to Me, except the Father which hath sent Me draw him.” (John 6:44)