Final answer:
The phrase 'flesh and blood cannot inherit' refers to the biblical idea that the physical nature of humans is not suitable for inheriting the spiritual kingdom of God.
Step-by-step explanation:
The phrase "flesh and blood cannot inherit" refers to a biblical concept, specifically from the Christian New Testament. In context, the phrase suggests that the mortal, physical nature represented by flesh and blood is not suited to inherit the kingdom of God, which is spiritual and eternal in nature. This idea is mentioned in 1 Corinthians 15:50 and underscores the belief that there must be a transformation from a physical state to a spiritual one in order to partake in eternal life.