During the Ramcharitmanas, Sita suggests: Ajara amara gunanidhi suta hohu; Karahun bahuta raghunayaka chhohu. May you never ever increase previous or die, my son; be considered a storehouse of virtue, and could Raghunatha be most gracious unto you. In accordance with Vedic cosmology, 108 is The premise of generation, https://www.youtube.com/watch?v=6cAOQp6Twlc&t=7s