Not so good—I'm sure it's all for the best.
不要说：我想这一切可能是最好的结果。

Ack! Try really hard not to say this! Right now, the grieving person doesn't see that anything is for the best except to have her loved one back.
我的天，千万别说这句话！这个沉浸在悲痛中的人并不觉得一切是好结果，除非她的至亲能够复活。

Better—It's hard to understand why these things happen．
不如说：真不知道为什么会发生这样的事情。