a pure heart and spirit的用法和样例：
- The goal of this command is love, which comes from a pure heart and a good conscience and a sincere faith.
- He who loves a pure heart and whose speech is gracious will have the king for his friend.
- He believed that God demanded perfect obedience from a pure heart and could not be sure that his obedience was perfect, his motives pure.
- Create in me a pure heart, O God, and renew a steadfast spirit within me.
- I have a pure heart of a newborn baby.