*Luke 12:1-5 (ESV)*
In the meantime, when so many thousands of the people had gathered together that they were trampling one another, he began to say to his disciples first, “Beware of the leaven of the Pharisees, which is hypocrisy.
Nothing is covered up that will not be revealed, or hidden that will not be known.
Therefore whatever you have said in the dark shall be heard in the light, and what you have whispered in private rooms shall be proclaimed on the housetops.
“I tell you, my friends, do not fear those who kill the body, and after that have nothing more that they can do.
But I will warn you whom to fear: fear him who, after he has killed, has authority to cast into hell. Yes, I tell you, fear him!
I believe this passage is pretty self-explanatory, but do think it is important to recognize that Jesus spoke of the “leaven of the Pharisees” as their continually self-perpetuating, infections sin… of hypocrisy.
Basically, this indicates that they were engaged in play-acting. And in particular, the warning was related to their religious activity and true attitude toward God.
However, Jesus also promised that there will come a time when every dusty corner of our hearts will be emptied of all secrets. Therefore, it is beneficial for us to develop a genuine respect the God who will judge rightly all we have ever said, done and even though.