Problems are an inevitable part of life, and one could argue that happiness is not the absence of problems, but rather the ability to be able to deal with them.
Is it to be able or being able?
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"The ability to be able" is still a bit redundant, right? How about these examples?
"Happiness is not the absence of problems, but rather" being able to deal with them.
"Happiness is not the absence of problems, but rather" having the ability to deal with them.
Either of these examples is grammatically correct and avoids the redundancy. Good luck!