Love should be both rich and rosy, but must be either rich or rosy.
 Oliver Wendell Holmes Sr., The Autocrat of the Breakfast-Table (1858). copy citation

Context

“but whether they were thinking about my paradox or not, I am not clear.—It would be natural enough. Stranger things have happened. Love and Death enter boarding-houses without asking the price of board, or whether there is room for them. Alas, these young people are poor and pallid! Love should be both rich and rosy, but must be either rich or rosy. Talk about military duty! What is that to the warfare of a married maid-of-all-work, with the title of mistress, and an American female constitution, which collapses just in the middle third of life, and comes out vulcanized India-rubber, if it happen to live through the period when health and strength are most wanted?]” source