人が肉体を持ち、地上に生まれたからといって、地上のことを全て理解するわけではないのと同様に、死んだからといって霊的世界を全て理解しているわけでもないのです。

tbd

Just because people are corporeal born to this world doesn't mean that they understand everything about it, similarly just because somebody's died doesn't mean that they understand everything about the incorporeal world.

梅雨時でもないんだから、傘は要らないんじゃない。

tbd

Since it's not the rainy season, there's no need for an umbrella.

万人の友は誰の友でもない。

tbd

A friend to all is a friend to none.

特に理解力がある訳でもない普通の中学生です。

tbd

He's just a normal junior high school student, not particularly intelligent.

別に制服着込んだ外宇宙の使者が、伴侶を求めて徘徊してるわけでもなかろうに。

tbd

It's not as if an emissary from outer space will have slipped into school uniform and be loitering around seeking a partner.

「見た目は悪くないがちょっと軽薄そう」な外見とは裏腹に、彼女はいないし、女性に手が早いワケでもない。

tbd

In contrast to his "not bad looks but seems a bit of a dandy" appearance, he didn't have a girlfriend and he wasn't particularly fast with the ladies.

まあその、自慢できる事でもないんだけど。というか、臆面もなく吹聴できる話でもない。

tbd

Well, that is, it's not something I can boast about. In fact, it's not something I can talk about in public without shame

不可能以外のなにものでもない。

tbd

It's all but impossible.

美術に凝っているわけでもない。

tbd

I'm not much of a one for art.

彼女は裕福でもなければ有名でもない。

tbd

She's neither rich nor famous.