Joseph Brodsky said this quote

“ Whether pleasant or dismal, the past is always a safe territory, if only because it is already experienced, and the species' capacity to revert, to run backward -especially in its thoughts or dreams, since there we are safe as well - is extremely strong in all of us, quite irrespective of the reality we are facing. Yet this machinery has been built into us, not for cherishing or grasping the past (in the end, we don't do either), but more for delaying the arrival of the present - for, in other words, slowing down a bit the passage of time. ”