Element
The life thread is an element essential to all living things. This thread of life joins all things together, providing an essential relationship between all life. This element is all that holds this world together.
Visualize this element of life, interconnecting all living things. Without it, everything would fall apart and into chaos.
そ, す
もと
None
You need to keep this element clean, so you make sure to wash it with soap (そ) every single day. This turns out to be pretty hard because the element is an invisible thread, but you do your best.
Imagine grabbing hold of the element that holds all life together and trying to wash it with soap. It's slippery so you keep dropping it and soap keeps going in your eyes.