聽其言觀其行　

◎ 聽其言觀其行 tīng qí yán guān qí xíng

[listen to what a person says and watch what he does;take note of sb.‘s words but judge him by his deeds] 聽一個人說什么,又看他做什么,常有“不僅要聽他說的,更重要的是看其做的如何”的含義