Chasidut su Salmi 35:78

Yet another interpretation of Malki Tzedek’s blessing of ‎Avram: We must try and understand the sequence of “blessed be ‎Avram to the Supreme G’d, the owner of heaven and earth, and ‎blessed this Supreme G’d Who acted as shield against your ‎oppressors delivering them into your hand.” When Malki Tzedek ‎refers to G’d as owning heaven and earth, we paraphrase this ‎three times a day in our prayers by referring to G’d as ‎קונה הכל‎, ‎‎“He Who owns everything.”

You should accustom yourself to pray even songs in a low voice, and to shout silently. You should say each word, whether in song or in study, with all your strength, as it is written (Psalms 35:10) "All my bones shall speak, etc." The shouting that comes from intense cleaving should be like a whisper.