2 sentences

1. 我对此也深信不疑。

   wǒ duì cǐ yě shēn​xìn​bù​yí.

   I'm convinced of it too.

   Source: OpenSubtitles

2. 我对他所说的话深信不疑。

   wǒ duì tā suǒ shuō de huà shēn​xìn​bù​yí.

   I have no doubt about what he said.

   Source: Dong Chinese Dictionary