So I read a bit of Robbie Burns this morning, To a Mouse, the one that almost everyone knows, wee sleekit cowrin' timourous beastie etc. certainly many people know the 3rd line of the 7th verse, the best laid schemes of man......

So this is an ode to a field mouse, who had made his home in the field that Burns then ploughed out.

Verse 1 describes the destruction and the panic of the mouse, verse 2 describes the regret of Burns actions but verse 7 and 8 now they're the ones that have the meaning

But Mousie, thou art no' the lane (you are not alone)

In proving foresight may be vain

The best laid schemes of mice and men, Gang aft agley (make your plan, it often doesn't work out)

and leave us naught but grief and pain, for promised joy (you thought life would be wonderful, hoho, not so.)

Still thou art blest, compared wi me

The present only touches thee ( you live in the moment.)

But Och! I backward cast my e'e on prospects drear (men look back with regret)

An forward tho' I cannot see, I guess and fear (Projection or what?) 

So in the late 18th centruy, old Robbie had summed up the necessity of living in the NOW.