I think he made a mistake in one point where he said 'the irreversible condition is not conducive to the synthesis of happiness'.
I gather from my understanding he meant the opposite: 'the reversible condition is not conducive to the synthesis of happiness'.
It is a good insight into why we should never look back and question - once the choice is made we commit fully. Doesn't mean we shouldn't reflect for future learning, but does mean that once the decision is made, that is it - even if we have the choice to change, we deny ourselves that choice.
We usually associate that with building power, but curious to see it also builds happiness.