The past

"What's past is prologue."

 - William Shakespeare (Tempest, I, i, 257)

The dark backward and abysm of time.
 - William Shakespeare (Tempest, I, ii, 50)

 "Lets not burden our remembrance with a heaviness that's gone."
- William Shakespeare (The tempest, Act V, Scene 1)

"When to the sessions of sweet silent thought

I summon up remembrance of things past."

 - William Shakespeare (Sonnet 30)

"O, Call back yesterday, bid time return."

 - William Shakespeare (Richard II, III, ii, 69)