Past, a feeling, an experience, and sometimes even an emotion. You can alter the facts or events  but you can never replace the feeling or to be more precise the origin of the feeling.
<a href="//commons.wikimedia.org/w/index.php?title=User:Anjali210&amp;action=edit&amp;redlink=1" class="new" title="User:Anjali210 (page does not exist)">Anjali210</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>