Summary of passage: Jesus says to enter through the narrow gate for it is the one that leads to life. The wide gate leads to destruction. He warns against false prophets whom you can recognize by their bad fruit for only good trees produce good fruit.
9a) Wolves hiding in sheep’s clothing (verse 15). Grapes and thornbushes and figs and thistles (verse 16). A good tree cannot bear bad fruit and vice versa (verse 18).
b) Figs from thornbushes and grapes from briers. Good must come from good and bad from bad.
10a) Do not be fooled by outward appearances or pretenses as inside may lurk darkness and evil.
b) Not a fan of how this question is phrased. Everyone is sincere in whatever belief they hold and they are misguided if their belief is not adherent to the Truth. Paul says in Acts men will distort the truth for the sole purpose of gaining disciples. 2 Peter is even stronger language, saying they will secretly (meaning purposefully and deceitfully) introduce destructive heresies in order to turn you from God. Verse 3 uses the word “exploit” you.
The Bible is clear that there are false teachers, powered by the devil, out to turn us from God. It seems that BSF is not so clear about that. They are definitely misguided and corrupted and sincere in their beliefs which is not the belief in God. “Possibly” needs to be stricken completely and misguided needs to be strengthened to deceitful.
c) Personal Question. My answer: We cannot judge people by outward appearances only by their actions will their heart be revealed. Most people live fake lives for all to see but inside they may be hardened.
Conclusions: This whole lesson has been hard for me to draw conclusions I think because it is self-explanatory. Here, we learn we cannot trust what people project or say; only what they do. Their heart will be revealed in their fruit.
It is also prudent here to ask ourselves: “What kind of fruit am I bearing?” For our own fruit will reveal our heart as well.