Literature Reference: 柯，木名；培，培养也。——《说文解字》 Ke, a type of wood; Pei, to cultivate. Source from 'Shuowen Jiezi'.
柯: The handle of an axe. By extension, it signifies a rule or principle.
培: Nurture and foster.
Meaning: Like a sturdy tree, continuously nurtured to grow.