Is the quote start by doing what's necessary then do what's possible and suddenly you are doing The Impossible intrinsic or extrinsic?

The quote "Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible" is primarily intrinsic. It emphasizes personal motivation, growth, and the internal drive to overcome challenges through perseverance and effort. The focus is on individual capability and mindset, rather than external rewards or validation.