I recieved a nice pshat this week.
Torah says that the Para Aduma needs to have no blemishes and never have been worked before, never had the yoke upon it.
Darshens Rav Moshe Shorr, if a person thinks they have no blemishes, it shows that they do not really have the yoke of heaven upon them.
The very fact that we are here on GYE shows that we recognize our shortcomings and ask HKBH to help us rectify them.