The Contrast Between Stability and Agility

A service that releases frequently generally has more stable releases, because they're better at doing them. It's almost a triangle, rather than a line, between two things - stability and agility. And the point of the triangle is how well are you able to assert and prove that this particular change is safe and good? Ecause if you can assert that really well, if you invest heavily in it, then you get to have both agility and stability.