つまり他人の未来を知る、という事は他人の現在と過去を熟知してなければならない訳だ。
それも、未来という答えを弾き出す為に、自分の人生と等価値になるほど深く。
だがそこまで他人の過去や現在を熟知してしまっては色々と不都合が生じてしまう。
I am not sure about what the second bold part refers to?
I believe it refers to the first bold one
Long story short, knowing strangers future you have to have knowledge of strangers past and present.
Moreover, in order to understand the future you have to have a deep understanding as much as you have for your life.
But, having such a deep understanding of others past and present will cause various incoveniences.
Is it correct?