Tā yīxiàng yǐ chéng xiāng dài, yíngdé le dàjiā de xìnrèn.
He has always dealt with others sincerely, earning everyone's trust.
Tips
usage
以诚相待 is a set phrase used to describe honest, sincere behavior toward others. The structure 以…相待 means 'to treat (each other) with…', so 以诚 means 'with sincerity'.