{Ye offspring of vipers} (genn(886d)ata echidn(936e)). These same
terrible words the Baptist had used to the Pharisees and
Sadducees who came to his baptism ( Mt 3:7 ). But these Pharisees
had deliberately made their choice and had taken Satan's side.
The charge against Jesus of being in league with Satan reveals
the evil heart within. The heart "spurts out" (ekballei) good
or evil according to the supply (treasure, 	h(8873)aurou) within.
Verse  33  is like  Mt 7:17-19 . Jesus often repeated his crisp
pungent sayings as every teacher does.