尽心

尽心	jìn xīn	with all of one's heart
尽	jǐn	to the greatest extent / (when used before a noun of location) furthest or extreme / to be within the limits of / to give priority to
尽	jìn	to use up / to exhaust / to end / to finish / to the utmost / exhausted / finished / to the limit (of sth) / all / entirely
心	xīn	heart / mind / intention / center / core / CL:颗,个