Luke 20:4 Meaning

2And spake unto him, saying, Tell us, by what authority doest thou these things? or who is he that gave thee this authority?

3And he answered and said unto them, I will also ask you one thing; and answer me:

4The baptism of John, was it from heaven, or of men?

5And they reasoned with themselves, saying, If we shall say, From heaven; he will say, Why then believed ye him not?

6But and if we say, Of men; all the people will stone us: for they be persuaded that John was a prophet.