We can comfort ourselves with platitudes; say "Life is short." "It can change at any time." Then the shock of the water, the pool on opening day, that phone call, that look hits us, and we know. The bruises and the tender spots, the winces and the tears that will never quite fade; the stains that sit until, familiar, we wouldn't find our way without them.
Our navigational systems
In the beginning, the wisdom shared in full knowledge, by those who sailed before us, is the lies we tell ourselves to get through the day, to get through the next hour, to get through that minute: we all know it.
But then the lies become insight become truth become wisdom. And we're passing on the coordinates to the next mariner, sailing on the seas of disaster.