指做事不守信用to not keep one's word

• 若大人先生们行不顾言、言不顾行，则下一代即使《三字经》《弟子规》倒背如流，也无用。

  If adults say one thing but do another then, even if the next generation can recite the Three-Character Primer and Standards for being a Good Student and Child, it will be of no use.