Start where you are. Use what you have. Do what you can.
The real wisdom here lies in what Ashe *isn't* saying—he's not asking you to wait for perfect conditions or to judge yourself against others' starting points. The three clauses work together to dismantle the most common excuse: the first says your circumstances are legitimate (wherever they are), the second refuses the lie that you need more than you possess, and the third converts everything into permission rather than obligation. When a recent college graduate takes an unpaid internship while freelancing on weekends instead of waiting for the ideal entry-level position, she's living this principle—not because she's extraordinarily motivated, but because she's accepted that her current small abilities compound faster than her future imagined advantages ever will.