Both provide milk as sustenance.
But the cow is able to replenish it’s milk by eating grass and converting its energy, while the coconut is a finite source: we drink it up once and it’s gone.
Goals and accomplishments are like cows and coconuts.
The goal is a renewable source of energy, providing a purpose as sustenance.
The accomplishment on the other hand, while a delicious treat, never fill us up for long.