1 Samuel 16:7 (NKJV)
But the Lord said to Samuel, "Do not look at his appearance or at his physical stature, because I have refused him. For the Lord does not see as man sees; for man looks at the outward appearance, but the Lord looks at the heart."
When you look at someone and hear them speak a few words, you really don't know much about them. To really know someone, it takes time to get to know their heart.
Pastor once said, if you really want to get to know what is inside a person, just jostle them up a bit and see what spills out. Don't be fooled by the fa??ade, people put up a good front. Someone else said character is what you are when no one is looking.