我姓曾我心真
[wŏ xìng céng wŏ xīn zhēn]
Translated directly, it would be something like 'My surname is Zeng and my heart is sincere/truthful.' It might represent honesty or earnestness. Or sometimes, 'xin zhen'(心真) can be playfully interpreted as ‘too sincere/serious’, which means one acts too honestly and takes things too seriously.