Philippians 1:17 But the other of love, knowing that I am set for the defence of the gospel.”
It is not that the Gospel needs defending (the Bible stands on it’s own) but that we should be able to explain, ‘how to be saved’ or ‘what does it mean’ and be able to do so with proper doctrine that is known as apologetics. Just giving someone an opinion on the what the Bible means can be dangerous. We are to know what we are talking about. And a person will know if they truly know if they can share it with someone and that person can comprehend it. For those who are lost just give them salvation because at that point that is all they need.