Why is perfection necessary for entering heaven?

According to God's standard, perfection is mandatory for those who wish to enter heaven. Leviticus 22:21 illustrates that any offering brought to God must be perfect to be accepted. This principle extends to humanity, where James 2:10 maintains that breaking even one law equates to being guilty of all. Because of sin, no one can achieve this standard independently, hence the need for a Savior. It is only through the perfect righteousness attained in Christ that believers can stand before God accepted and justified, as He fulfills the requirement of holiness for them.