Best only to worry about what you can control, no? If there are external and internal factors to your success then you should spend 100% of your time focusing on the internal ones, since these are the only ones where productive gains can be made.

Also, the research is in. Grit is the single biggest predictor of economic success. Anyone who is lacking in economic success can be reasonably assumed to lack grit. Whether you label that “lazy” or not is semantics.