Concerning the faithful custom on Lag B'Omer eve, when candles are sold, when the names of certain Tana'im and Emora'im are mentioned and candles lit in their honor:
I have heard that at that very moment, the Tzaddik himself comes from the World of Truth and peers into the face of the person; he leaves remembering that person's name and form. When the person dies, the Tzaddik comes to their defense, saying how that person spent of their money and lit candles in honor of Tzaddikim.
Not having seen us and not having known us, but for the sake of their faith, as much merit as possible is sought for them; all the more so for a person who learns Torah and mentions their names in the Mishnah or tractate making his lips move in his grave – that person is helped even more.