*
Most of the most quotable writers of English were prosy writers (even if not actually writing prose) - e.g. Bacon, Sam Johnson, Wilde, Shaw - and most of the most poetic writers are not very quotable - Sidney, Spenser, Tennyson...
I think it is distinctive to Shakespeare - and perhaps that which sets him above all others - that he is both: as smooth and musical as Spenser, as pithy and gnomic as Bacon.
(Other writers who combine poeticism and prosiness in this way stand next in line to Shakespeare - for example Chaucer.)
*