Enough means sufficient to meet a need; as John Zdanowski uses it, the word names the recognition that what a person has right now is enough, measured by how much financial capital their current lifestyle requires.
In ordinary usage, enough works as a determiner, pronoun, and adverb for a quantity that satisfies a requirement without excess. The word always depends on a standard of need: something is enough only relative to what it is for.
John's sense applies that standard to money and life together. It pairs an attitude, recognizing that what is present now is enough, with a concrete financial question: how much financial capital the lifestyle a person is already living actually requires. The answer turns enough from a feeling into a number that can be known and met.
Recognizing that what you have right now is enough, how much Financial Capital does your current lifestyle require.