You have probably heard the quote, which is often misattributed to Francis of Assisi, “preach the Gospel, and if necessary use words.” However, the Bible says in 1 Corinthians 1: 21 that “it pleased God through the folly of what we preach to save those who believe.” In his book, Spiritual Disciplines of the Christian Life, Donald Whitney makes this important observation about the necessity of speaking the Gospel message,
Often it is the message of the Cross lived and demonstrated that God uses to open a heart to the gospel, but it is the message of the Cross proclaimed (by word or page) through which the power of God saves those who believe its content. No matter how well we live the gospel (and we must live it well, else we hinder its reception), sooner or later we must communicate the content of the gospel before a person can become a disciple of Jesus. The example of Christianity saves no one; rather it is the message of Christianity—the gospel—that “is the power of God for salvation” (Romans 1: 16).”
God help you to do so.