Sure, an understanding that I have a closed, fixed pool of resources to balance between efforts.
My personal model is mind / body / spirit (or mental / physical / artistic). I've learned through failure that high and exceptional performance in one direction draws fuel from the other(s).
If my performance is out of balance for a long enough period, I seem to accrue a kind of debt repaid over periods of burnout and depression.
Curiosity and aptitude for math. I've found this about 25 years too late for it to make much of a difference.