We are told that when the band of men and officers approached his Master, in order to take Him prisoner, Judas "stood with them." Yet this was a man who for three years had been a constant companion of Christ, had seen His miracles, had heard His sermons, had enjoyed the benefit of His private instruction, had professed himself a believer, had even worked and preached in Christ’s name! "Lord," we may well say, "what is man?" From the highest degree of privilege down to the lowest depth of sin, there is but a succession of steps. Privileges misused seem to paralyze the conscience. The same fire that melts wax, will harden clay.
Let us beware of resting our hopes of salvation on religious knowledge, however great; or religious advantages, however many. We may know all doctrinal truth and be able to teach others, and yet prove rotten at heart, and go down to the pit with Judas. We may bask in the full sunshine of spiritual privileges, and hear the best of Christian teaching, and yet bear no fruit to God’s glory, and be found withered branches of the vine, only fit to be burned. "Let him that thinks he stands, take heed lest he fall." (1 Cor. 10:12.) Above all, let us beware of cherishing within our hearts any secret besetting sin, such as love of money or love of the world. One faulty link in a chain-cable may cause a shipwreck. One little leak may sink a ship. One allowed and unmortified sin may ruin a professing Christian. Let him that is tempted to be a careless man in his religious life, consider these things, and take care. Let him remember Judas Iscariot. His history is meant to be a lesson.
Source: J.C. Ryle, John 18
Calvin remarks on the course of a backslider, "At first the fault will not be very great; next, it becomes habitual; and at last, after the conscience has been laid asleep, he who has accustomed himself to despise God will think nothing unlawful, but will dare to commit the greatest wickedness."
Henry remarks, "The sin of lying is a fruitful sin, and therefore exceeding sinful. One sin needs another to support it, and that needs another."
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In regard to Jesus’ command to the soldiers that they allow his disciples to leave Gethsemane so that their faith would not be tested beyond their current ability to endure and so none of them be lost, J.C. Ryle writes:
We need not hesitate to see in this incident an instructive type of all our Savior’s dealings with His people even at this day. He will not allow them "to be tempted above that which they are able to bear." He will hold the winds and storms in His hands, and not allow believers, however sifted and buffeted, to be utterly destroyed. He watches tenderly over every one of His children, and, like a wise physician, measures out the right quantity of their trials with unerring skill. "They shall never perish, neither shall any one pluck them out of His hand." (John 10:28.) Forever let us lean our souls on this precious truth. In the darkest hour the eye of the Lord Jesus is upon us, and our final safety is sure.
Source: J.C. Ryle, John 18