听到你平安的消息，我感到万分欣慰。

Tīngdào nǐ píng'ān de xiāoxi, wǒ gǎndào wànfēn xīnwèi.

Hearing that you are safe, I felt extremely relieved.

在这么关键的时刻得到你的支持，我感激万分。

Zài zhème guānjiàn de shíkè dédào nǐ de zhīchí, wǒ gǎnjī wànfēn.

To receive your support at such a critical moment, I am deeply grateful.

想到自己犯下的错误，他心里万分后悔。

Xiǎngdào zìjǐ fànxià de cuòwù, tā xīnli wànfēn hòuhuǐ.

Thinking of the mistake he made, he felt extremely regretful.