The Past
From Stoic Wiki
What’s the good of dragging up sufferings which are over, of being unhappy now just because you were then? What is more, doesn’t everyone add a good deal to his tale of hardships and deceive himself as well in the matter? Besides, there is a pleasure in having succeeded in enduring, something the actual enduring of which was very far from pleasant; when some trouble or other comes to an end the natural thing is to be glad.
Two elements must therefore be rooted out once for all - the fear of future suffering, and the recollection of past suffering; since the latter no longer concerns me, and the former concerns me not yet.