请教高手two sentences？？

but in an old man who has known human joys and sorrows, and has achieved whatever work it was in him to do.  

中介词in an old man 和in him 中的in是什么意思？

the best way to overcome it so at least it seems to me ---------is to make your interests gradually wider and more impersonal, until bit by bit the walls of the ego recede,............

so at least it seems to me 中前的so 是什么意思？

我觉得这两句话中的in 和 so用的很奇怪？  

我的意见 IN是符合的意思，而SO是如此看来的意思。请指正！

这是哪里来的文章？

new concept4

thank you for your answer!!

but "so"  是一种倒装，本应该在seems后,代词”这样“，

in 我还是不知道why!