A few quotes from the Rabbi on 'Traditions of the Fathers'
in which he points out hidden meanings in A Song for the Sabbath Day that embellish honoring one's father and mother
"Above the thunder of mighty waters, more majestic than the breakers of the sea is the LORD, majestic on high. Your decrees are indeed enduring; holiness befits Your house, O LORD, for all times." 'Above the thunder of mighty waters' – was meant to say: 'from the voice of Torah'. A notarikon [acronym] for 'from the voice' –from the voice of Torah, that is likened to waters, as has been said: Ho, all who are thirsty, come for water'– can be found in 'more majestic than the breakers of the sea is the LORD, majestic on high' that spells out the [Hebrew] initials of 'my mother and my father', meaning that one honors one's father and mother to merit the World to Come. When is it most fitting and becoming to do so? On the Sabbath day, entitled 'sacredness', and by so doing one also gains the merit of long life.
Dvar Tov, p. 163, Jerusalem, 1914