Jesus came into the world to reveal God's truth and love to men, and to save them, and men are saved by believing in Him. But how could the men of His day, who saw Him working at the carpenter's bench, and living the life of an ordinary man of humble toil and daily temptation and trial, believe His stupendous claim to be the only-begotten Son of God, the Saviour of the world, and the final Judge of all men? Any wilful and proud impostor could make such a claim. But men _could_ not and _ought_ not to believe such an assertion unless the claim were supported by ungainsayable evidence. This evidence Jesus began to give, not only in the holy life which He lived and the pure Gospel He preached, but in the miracles He wrought, the blind eyes He opened, the sick He healed, the hungry thousands He fed, the seas He stilled, the dead He raised to life again, and the devils He cast out of bound and harassed souls. The Scribes and Pharisees witnessed these miracles, and were compelled to admit these signs and wonders. Nicodemus, one of their number, said to Jesus, "Rabbi, we know that Thou art a teacher come from God: for no man can do these miracles that Thou doest, except God be with him" (John iii. 2). Would they now admit His claim to be the Son of God, their promised and long-looked-for Messiah? They were thoughtful men and very religious, but not spiritual. The Gospel He preached was Spirit and life; it appealed to their conscience and revealed their sin, and to acknowledge Him was to admit that they themselves were wrong. It meant submission to His authority, the surrender of their wills, and a change of front in their whole inner and outer life. This meant moral and spiritual revolution in each man's heart and life, and to this they would not submit. And so to avoid such plain inconsistency, they must discredit His miracles; and since they could not deny them, they declared that He wrought them by the power of the Devil. Jesus worked these signs and wonders by the power of the Holy Spirit, that he might win their confidence, and that they might reasonably believe and be saved. But they refused to believe, and in their malignant obstinacy heaped scorn upon Him, accusing Him of being in league with the Devil; and how could they be saved? This was the sin against the Holy Spirit against which Jesus warned them. It was not so much one act of sin, as a deep-seated, stubborn rebellion against God that led them to choose darkness rather than light, and so to blaspheme against the Spirit of truth and light. It was sin full and ripe and ready for the harvest.