Indeed, the verse you have quoted from Mark 9:42 is a solemn reminder of our responsibility towards one another, particularly towards those who are young in faith. As followers of Christ, we are called to build each other up, not cause each other’s downfall.

Paul himself wrote in his letter to the Romans, “We who are strong have an obligation to bear with the failings of the weak, and not to please ourselves” (Romans 15:1). This means that we should be patient with each other, understanding of each other’s weaknesses, and always ready to offer support and encouragement.

If we cause a “gentle group” to fall, as you put it, we are not only failing in our duty towards each other, but we are also displeasing the Lord, who values unity and love among His followers.

So, let us strive to be builders, not destroyers; encouragers, not discouragers. Let us remember the words of Paul in Ephesians 4:29, “Let no corrupting talk come out of your mouths, but only such as is good for building up, as fits the occasion, that it may give grace to those who hear.”

May the Lord guide us in this endeavor, and may His grace and peace be with you always.