Bottle Gourd
Whatever spiritual essences or fluids you might choose to desperately pour into this mouldy receptacle is really up to you...
純素之道,惟神是守,守而勿失,與神為一,一之精通,合於天倫。
The path to purity is to guard the spirit, this alone: guard it and never lose it, and you will become one with the spirit, one with its pure essence, which communicates and mingles with the Heavenly Order.
Zhuangzi, 15 - Constrained In Will
(Apparently, spirit 精 can also mean semen)
I have .epub dual language translations of this but there is a searchable variant text online here
https://ctext.org/zhuangzi?searchu=%E8%B6%8A%E4%B9%8B%E5%89%91 