Literature Reference: 去为投金简，来因挈玉壶。—— 《和微之春日投简阳明洞天五十韵》 Departing to cast a golden scroll, returning with a jade flask in hand. Source from 'He Wei Zhi Chun Ri Tou Jian Yang Ming Dong Tian Wu Shi Yun'.
投: Tendency. To cast, to hurl, to throw. Use with caution.
金: Gold, the precious metal. Symbolizes the prosperity of wealth and abundance.
Meaning: Casting gold symbolizes selfless devotion and lofty spiritual pursuits.