In the Osashizu is the following:

Buds sprout from knots. May 12, 1889

Knots are sufferings or inconveniences in our lives.  Buds are joy and happiness.  If one does not understand the law of causality, one could question how joy can emanate from sorrow?

Understanding causality gives us the information to turn our inconveniences into joy. What we do today determines what will happen in the future.  We can always respond in a negative way to any inconvenience that may occur, which will continue to result in sufferings in the future; or we can respond positively and plants seeds for a joyous future. Causality gives us an opportunity to change our future. We always have control of our future.