One thing this quote seems to be encoding is that fulfillment is often an attention problem before it is an achievement problem.
The deeper claim is not that gratitude magically produces joy.
The deeper claim is that what awareness repeatedly registers becomes psychologically available in a way that what awareness ignores does not.
Attention is never neutral.
It is always measuring something.
Sometimes it measures absence.
Sometimes comparison.
Sometimes distance from a goal.
Sometimes what remains unfinished.
When awareness becomes organized around deficiency, life can begin to feel defined by what is not yet present, even when meaningful things already are.
The quote’s focus on gratitude points toward a different orientation.
Gratitude is not being presented as a moral virtue earning a reward.
It is functioning as a way of directing attention toward what already exists.
Under this reading, fulfillment is not portrayed as a prize waiting at the end of acquisition.
It becomes something that can only be experienced through what awareness is capable of noticing.
The structural claim underneath the quote is subtle.
Two people can occupy remarkably similar circumstances and experience those circumstances differently because their attention is continuously gathering different evidence about reality.
One person may primarily register what is absent.
Another may primarily register what is present.
The external situation may overlap far more than their experience of it.
That is why the sentence places such unusual weight on focus.
The quote is suggesting that what becomes visible to consciousness is partly governed by where consciousness repeatedly looks.
The gratitude language draws attention.