14 How narrow is the gate and difficult the way that leads to life, and there are few who find it! 15 “Watch out for false prophets, who come to you in sheep’s clothing but inwardly are voracious wolves. 16 You will recognize them by their fruit. Grapes are not gathered from thorns or figs from thistles, are they? 17 In the same way, every good tree bears good fruit, but the bad tree bears bad fruit. 18 A good tree is not able to bear bad fruit, nor a bad tree to bear good fruit.
The Gemara relates that Abaye and Rava, when they were children, were seated before Rabba. Rabba said to them: To whom does one recite blessings? They said to him: To God, the All-Merciful. Rabba asked them: And where does the All-Merciful reside? Rava pointed to the ceiling. Abaye went outside and pointed toward the heaven. Rabba said to them: You will both become Sages. It is as the popular saying goes: A cucumber can be recognized from its blossoming stage. Similarly, a great person can be recognized even from a young age.