Reference: Matt 5:13, Col 4:5-6
Jesus said that we are the salt of the earth. If we want to impact the world for Him, we need to be salty. Salt has many properties. It is used for seasoning, preserving, melting ice, disinfecting, etc. It also stings if it gets into a wound. We may need to be like all of these. Paul said "Conduct yourselves with wisdom toward outsiders, making the most of the opportunity."