What should we think about claims that nobody truly obeys God?

The bible says nobody is perfect, but I believe God rewards you for partial obedience if you are humble enough to respect other people you know who do not obey perfectly either. I do not obey God perfectly, but God rewards me, when I partially obey God, and when I upgrade my level of obedience through the days or months.

What should we think about claims that nobody truly obeys God?
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