John Calvin Commentary Matthew 19:25

"And when the disciples heard it, they were astonished exceedingly, saying, Who then can be saved?" — Matthew 19:25 (ASV)

And his disciples, when they heard these things, were greatly amazed. The disciples are astonished, because it should awaken in us no small anxiety that riches obstruct the entrance into the kingdom of God; for, wherever we turn our eyes, a thousand obstacles will present themselves.

But let us observe that, while they were struck with astonishment, they did not shrink from the doctrines of Christ. The case was different with the one who was recently mentioned, for he was so alarmed by the severity of the commandment that he separated from Christ; while they, though trembling and inquiring, who can be saved? do not draw back, but desire to overcome despair.

Thus, it will be beneficial for us to tremble at God’s threats: whenever he proclaims anything gloomy or dreadful, provided that our minds are not discouraged but are instead aroused.