Whoever believes and is baptized will be saved, but whoever does not believe will be condemned.
Salvation is promised to believers because by faith in the Son of God they receive free justification and the Spirit of regeneration. Baptism testifies to God's grace, yet it is not absolutely necessary to salvation; His grace is not confined to signs, though we must not despise them. Unbelievers draw severer punishment upon themselves by rejecting the salvation offered to them.
AI summary
Christ rebuked His apostles for unbelief even though they had testimony from those who saw Him risen; the fault lay not in the proofs but in the hardness of their hearts. Pride prevented them from believing witnesses Christ had chosen. We cannot excuse ourselves by saying we did not see Him ourselves; we ought to believe those who did.
AI summary
Commenting on Mark 16:14-18
And these signs shall follow them that believe,.... Not all of them, but some; and not always, only for a time; and which were necessary for the confirmation of the Gospel, and the establishment of Christianity in the world; and not only believing hearers, but believing ministers of the word, are chiefly designed; and this is said, for the encouragement both of those that preach...