Imam Baqir (a.s) said: “Greet aloud whenever you want to greet. Do not say they did not reply, since they may have not heard you. Also reply aloud when you want to respond to someone who is greeting so he does not say he greeted and no one replied.” He then added: “Imam Ali (a.s) said: Do not get angry. Do not make others angry. Greet aloud. Speak fair to the people. Pray at night when others are asleep so that you can safely enter Heaven. Then he recited: “The Source of Peace (and Perfection), the Guardian of Faith, the Preserver of Safety.” [The Holy Quran: Hashr 59:23]