This is a true truth quote from John Bunyan that I just wanted to share with you:

You have some professors [ie, people who profess to be Christians] that are only saints before men when they are abroad [in public] but are devils and vipers at home; saints by profession, but devils by practice; saints in word, but sinners in heart and life. These men may have the profession, but they lack the fruits that adorn true repentance.

The Barren Fig Tree, John Bunyan