I have an opportunity to serve a local university to become a mentor of aspiring high-school teachers and prepare them to pursue their teaching life. In a chat session with the aspiring teachers, we discussed Christian teachers’ identity and responsibilities in secular schools. Romans 2:18-20 seems to give us some encouragement and reminder: “We know His will, and approve the things that are excellent, being instructed out of the law, and are confident that we are a guide to the blind, a light to those who are in darkness, an instructor of the foolish, a teacher of babes, having the form of knowledge and truth in the law.” As Christians, our moral standard supposes us to be role models for others on campus. Suddenly, an aspiring teacher raised a seemingly irrelevant question: “Why are there a large number of S1 kids converted to Jesus through Gospel campus activities every year, but there are so few Christians in the graduation classes?” Our conclusion is: “Testimony!” Have we lived a good testimony for our kids, which is the “form” mentioned in the verses? The following scripts form us an important reminder: We say not to steal; do we steal? We stress people should not commit adultery; do we commit it? We boast about the school rules; do we break the rules ourselves and dishonor the Lord? In short, it is simply to “walk the talk!”