Tom Perrotta said this quote

Nora had been training herself not to think too much about her kids. Not because she wanted to forget them - not at all - but because she wanted to remember them more accurately. For the same reason, she tried not to look too often at old photographs or videos...After a while, these scraps hardened into a kind of official narrative that crowded out thousands of equally valid memories, shunting the losers to some cluttered basement storage area in her brain.