"You'd better make sure your enemies underestimate your strength; otherwise, it's best not to have any enemies at all. Only country bumpkins keep all their wealth on them."
Aizen had always remembered this quote, a timeless piece of wisdom that he deeply agreed with. As the Old Sages Said… . Aizen believed that only those who remembered and practiced such advice could survive for long.
He wanted to live for a long time, so he always kept that saying in mind.
And he had succeeded—his enemies had underestimated him and underestimated his strength.
No one could imagine the true power of his Star-Absorbing Technique. They could speculate about his high level of internal energy, since it wasn't a secret, at least not to someone like the Red Lady.
But his internal energy was only one part of his overall strength.