Why japanese cars and electronics are renowned worldwide for their quality? The jp developers and manufacturers adopted an attitude, which was also made as one of their most fundamental management principles since the 70s that complete product perfection is unreachable, and nonetheless they shall never give up or pause to approaching the limit even though the product might already seem perfect.
Werner Heisenberg's uncertainty principle clearly states that absolute definition of a physical property with complete accuracy is unattainable in human dimension. The term perfect indeed sets the upper limit, in other words a goal to those who need a target in their life.
Chinese proverb also says there is always a higher mountain. How much you can see depends on where you stand. Just do the best you wish to be and not to pressure yourself for perfect which is an art but not real .