Aliena vitia in oculis habemus, a tergo nostra sunt
Idiomatic translations of "Aliena vitia in oculis ..."
Meanings of "Aliena vitia in oculis ..."
Another's faults are before our eyes; our own (faults) are behind us. It is easy to see what is wrong with others and not know we are equally erred. It is easy to speak of faults of others before us, and easy for others to speak of ours behind us.
From "On Anger" by Seneca.
The Bible also addresses it in Matthew 7:3 (as cited in the German explanation).
Bibelzitat, gemäß NT, Mt 7,3