There is a probability to the car not stopping when you put on your brakes, depends on speed, weather conditions, how quickly you want to stop if you have ABS, how regularly your brakes are serviced and lastly of all if anybody dislikes you enough to cut them.
You can't tell non believers that your word sanctifies them and is truth and Heb 11:1 doesn't work either. Why don't you answer their questions in a SCRIPTUAL fashion as those are more than likely the areas they are seeking in. Not how do we discern truth and I would actually say that the Holy Spirit helps us Discern what is true not the words on the page that say the bible is truth --- stick with me here... --- Because that has nothing about discernment which is what opens your eyes to seeing the truth in the bible. I can't remember where the verse is about that I think its in the Spiritual Gifts 1 Corinthians 12.