“The eyes of the world are upon us. They don’t read the Bible, but they read you and me, and we talk more by our walk than in any other way. We are ‘living epistles, known and read of all men.’… I said to some one the other day, ‘That man must have been in the army or in a military school.’ He said, ‘Yes; how did you know?’ I said, ‘By the way he walks.’ There are some people that you can tell have been with Jesus Christ by their walk.
Many a person who is engaged in active Christian work, or who takes a leading part in the prayer meeting, is so faulty in his daily walk as to be a stumbling-block to others. Sometimes the last people to be favorably impressed by professing Christians are those who know them in their home life. This is all wrong. Test yourselves therefore and see if you indulge in any questionable habit, anything in you example and influence that is likely to lead astray those who read your conduct.”
-D. L. Moody
(I read want to read some of his books.)