You have to become perfect because if not, mental flaws make you unreliable, but perfection is reliable.

You can trust in moral perfection, but not moral imperfection.

You can trust a perfectly built vehicle, but not a poorly built vehicle with flaws or you'll constantly be worried when it will fail you next.

Why not strive for your perfect health, cleanliness, mentality, intelligence, and morality, when it's realistically achievable, it makes no sense.