1. There is a sincere concern for quality.
    这是对质量的真正关心。

2. I´m sincere Christian. I´ve accepted Jesus Christ as my personal savior.
    我是一个虔诚的基督教,我已接受耶稣基督为我个人的救主.

3. I gave him my sincere thanks.
    我真诚地向他道谢。