Privatized Christianity is no Christianity at all. It's impossible to know Christ and not proclaim Christ.
I lived for along time under the rule, "I live out my faith so I don't need to talk about it all the time", mindset for years. This was also when I was extremely ignorant of what a disciple of Christ was. When I began to actually know God, I could not shut up about him. And now I can't stop sharing in any venue I get. Not being annoying preacher man at every person in my life, but bold about the goodness of God and not afraid to speak bible truths in hopes all hear and are changed by the gospel.