The Jews argued that their traditions were
the only truth on earth and all others were
false.

But the fact was that they were Jews accord-
ing to the flesh, not Jews according to faith.
So Jesus said they were children of the devil
and that they were of the "synagogue of Satan".

They blasphemed the Christians (Acts 18:6),
and claimed their miracles were of the devil
(Matthew 12:24). They were stubborn and
hung on to their traditions, making it hard to
reach them with the truth of the gospel.