I feel oppressed by the heat.

我感到闷热难受。

youdao

I feel oppressed by worry.

我因忧虑而感到心情沉重。

youdao

And that's why he constructs the letter to say, as I said, if you're troubled, if you feel like you're oppressed you're supposed to be comforted by this text.

这就是他写信的原因，正如我所说，如果你感到受压迫，你就将在这本书里得到安慰。

youdao