At the beginning of the Sermon on the Mount, Jesus compares his disciples to salt, light, and a city set on a hill. All these things exist not for themselves, but for something else. In the same way, Christians are meant to make the world a better place. The Christian responsibility is to affect the culture as salt, light, and a city on a hill.
Mass Readings
Reading 1 – Isaiah 58:7-10
Psalm – Psalm 112:4-9
Reading 2 – 1 Corinthians 2:1-5
Gospel – Matthew 5:13-16