Jīnwú-zúchì, rénwú-wánrén, nǐ bié duì zìjǐ tài kēkè le.
No gold is pure and no one is perfect, so don't be so hard on yourself.
Tips
usage
Usually the first half of the couplet 金无足赤,人无完人: just as there is no perfectly pure gold, there is no perfect person. Said to excuse a fault or to ask for patience. 足 "full" and 赤 "red" describe gold of full purity, which has a reddish glow.