The Past (n.) is not the object our our anxieties because it is in the past, but because it may be repeated, because it may become future.
The Past (n.) not worth remembering is the one that cannot become a present.
The Past (n.) can be considered necessary only by forgetting that it came to be — and should that forgetfulness also be necessary?
The Past (n.) is immutable in its actual 'thus', but its possible 'how' could have been otherwise — and repentance wants to repeal even that actuality.
The Past (n.) is understood only in the contradiction between the certainty that it happened and the uncertainty that it happened at all; whoever constructs it as necessary has misunderstood it.