Jung and the bucket of water

The bucket of water is a metaphor I have seen or heard used in the writings or sayings of great people, aware of being small no matter their greatness. Jung used this metaphor explicitly in his memorial writings. I took the liberty to agree with him. The most recent to say this, without explicitly making reference to the bucket of water, was my Qi-Gong and Taiji-Quan instructor, Isidoro Li Pira: this knowledge does not belong to us and it is never ours. There are other great stories about buckets of water, calling for apprehension of impermanence and living totally despite time and the craze of being temporary. I just wonder what happens if the bucket is empty.