As the faithful of the LORD, Good News should be contagious. It should be nearly impossible to keep to ourselves. That is the example we see from Exodus chapter 18. As soon a Moses saw his father-in-law he couldn't help but tell him all that the LORD had done for him and the people of Israel. As Christians, we have the Good News of Eternal Salvation through Christ, and that should be something that's impossible to keep to ourselves.

Exodus 18:7-12

7So Moses went out to meet his father-in-law and bowed down and kissed him. They greeted each other and went into the tent. 8Then Moses recounted to his father-in-law all that the LORD had done to Pharaoh and the Egyptians for Israel’s sake, all the hardships they had encountered along the way, and how the LORD had delivered them.

9And Jethro rejoiced over all the good things the LORD had done for Israel, whom He had rescued from the hand of the Egyptians. 10Jethro declared, “Blessed be the LORD, who has delivered you from the hand of the Egyptians and of Pharaoh, and who has delivered the people from the hand of the Egyptians. 11Now I know that the LORD is greater than all other gods, for He did this when they treated Israel with arrogance.”

12Then Moses’ father-in-law Jethro brought a burnt offering and sacrifices to God, and Aaron came with all the elders of Israel to eat bread with Moses’ father-in-law in the presence of God.