You need ability to begin, while you need agility to last. You acquire ability, for example, when you train to be a lawyer, a doctor, or an engineer. Having a particular ability means you have acquired specific skills based on the test cases you have been exposed to. Agility, on the other hand, is how you manage to extrapolate acquired skills to novel situations.
Agility requires the cross-breeding of insights and skills and the design of bespoke solutions for a given problem.
A static skill that is not honed is not enough; dynamic and evolving skill sets are the keys to making it in the marketplace.
Johnson Oyero 