Agile is a mindset.
It is not a goal or end state. You can't be agile because someone or something (including certificates) say so.
There are no agile people (Sorry Yves). But, there can be agile organizations.
Agile organizations are in constant pursuit of improvement. They constantly learn and improve quality. They use the proper tools and processes to support improvement. And improve those as well.
Agile organizations respond quickly and effectively in a state of uncertainty. To succeed in a state of uncertainty, agile organizations trust their people. People feel safe to experiment. There is no penalty for failure, rather encouragement for learning. Agile organizations bring out the best their in people.
Agile is not a private club. Everyone can join in. It embraces collaboration and abhors exclusion.
Agile is about putting people first.
All the good things that come later are side effects.