If you cannot mould yourself entirely as you would wish, how can you expect other people to be entirely to your liking? (Thomas á Kempis, Medieval German canon)
It seems to be true that we expect others to live up to our personally established standards, when we most often are unable to live up to those same criteria ourselves. Our expectations of others are higher than what we demand of ourselves. It’s the old “Do as I say, not as I do” fallacy. Set the standard high, live up to it, and be careful not to judge others.
Do not judge, or you too will be judged. For in the same way you judge others, you will be judged, and with the measure you use, it will be measured to you. (Matthew 7:1-2)