I see this as a very pragmatical thing to
a) keep up attentiveness (for as I´m not paying attention to my current way of experiencing there´s no way of influencing it)
b) turn on sensousness / cultivate felicity (as a concious decision to enjoy this moment).
If I don´t practice a)+b)
now (i.e. my only moment of being alive), when am I going to do it?
Later? Well, that´s going to be now, too (obviously). So if I´m unwilling to do it now, why should that be different in an hour, tomorrow, a year? The inevitable result would be that I never get around to it.
With that being said, I find the resistance to do it now a useful starting point to see why I´m putting it of:
complacency, lazyness (as in lacking pure intent) or some sense of feeling bad and out of that an unwillingness to put in the effort.
I don´t see that there´s neccessarily a "magic insight" to this phrase which of its own is going to produce the pure intent that is neccessary to overcome my habitual resentment to this (and every consecutive) moment.
Nad A.:
I'm finding that various things at odd times will seem to produce felicity but then utterly fail on most occasions.
Have you noticed the difference between occassions when those "various things" produce felicity or fail to do so?
For me certain objects are easier to take delight in than others which is manifesting in a sense of indifference "Bla, I´ve seen that before!" and that´s where I find having / being naivete is especially neccessary ...in a curious, questioning attitude to everything "Hmm, I wonder what that is?". (wordless of course)
I had (and sometimes still have) to investigate why I feel stupid/cynical for being naive, but it certainly seems to be an important factor for felicity.