Rebbi, Rabbi Yehudah HaNasi, taught a lesson about how Jews should respond whenever the name of a righteous person is mentioned. He cited (Proverbs 10:7): "The remembrance of the righteous is for blessing." When someone mentions a tzaddik, a righteous person, the appropriate response is to add a blessing.
Rebbi then identified the ultimate Tzaddik: God Himself, called "the Life of the worlds." When God's name is mentioned, one should respond with "Amen," affirming and blessing. The proof comes from (Psalms 145:17): "The Lord is a tzaddik in all of His ways." If God is righteous, and the remembrance of the righteous calls for blessing, then every mention of God demands a verbal response of praise.
This teaching shaped a deeply ingrained Jewish habit. To this day, when a deceased righteous person is mentioned, Jews add the phrase "zikhro livrakha," meaning "may his memory be for a blessing." When God's name is invoked, listeners respond with "Barukh Hu u'Varukh Shemo" or "Amen." These are not empty formulas. They are the living fulfillment of the principle Rebbi articulated from Proverbs.
The deeper implication is that speech about the righteous is never neutral. To mention a tzaddik without adding a blessing is to leave something incomplete, like opening a door without walking through it. The righteous, whether human or divine, generate blessing simply by being remembered. The listener's role is to catch that blessing and give it voice. In Rebbi's teaching, memory itself becomes an act of worship, and every conversation about the righteous becomes a miniature prayer.