expression, noun
source of vitality; life sustenance
A set phrase meaning something that gives one the energy or motivation to live; often used metaphorically for emotional or spiritual nourishment.
See also: 糧 (かて)
彼にとって音楽は生きる糧だ。
For him, music is what keeps him going.
読書が私の生きる糧になっている。
Reading has become my source of vitality.