I think to tame down the word perfect to mean not committing sin, is to compromise on sin. Sin is much deeper and nastier.
In my mind it is impossible to become more perfect. It is impossible to grow if you are perfect. Perfect is perfect as God the Father is perfect.
Was Jesus at the time he said this as perfect as his heavenly Father? Was Jesus at age 12 as perfect as his heavenly Father? Has Jesus always been as perfect as his heavenly Father?

