Limits.

In definition as it concerns the school walls and settings, limit is the value that a function or sequence "approaches" as the input or index approaches some value.

SourceLimits are essential to calculus (and mathematical analysis in general) and are used to define continuity, derivatives, and integrals. Source

Limits are needed to make the pursuit well had and meaningful and these two can only come from a continuous drive. The jargon associated to limits makes me wonder why many are not able to try the calculus aspect of that word truly represents.

Limits makes us discover the reason why we must keep doing what we may and to keep forging ahead.

The limitations as forced upon us as limits makes the story interesting and or uninteresting.
Limits and limitations are a thing of the mind and the one way to overcome such is by pushing the limits like they never existed.

In wining, there are truly no limits and only that understanding can make all the difference.