The most important tribute any human being can pay to a poem or a piece of prose he or she really loves is to learn it by heart. Not by brain, by heart; the expression is vital.
I owe everything to a system that made me learn by heart till I wept. As a result I have thousands of lines of poetry by heart. I owe everything to this.
The private reader of listener can become an executant of felt meaning when he learns the poem or the musical passage by heart. To learn by heart is to afford the text or music an indwelling clarity and life-force.