Mark 4:10-12 NIV

10 When he was alone, the Twelve and the others around him asked him about the parables.
11 He told them, "The secret of the kingdom of God1 has been given to you. But to those on the outside2 everything is said in parables

References for Mark 4:11

12 so that, " 'they may be ever seeing but never perceiving, and ever hearing but never understanding; otherwise they might turn and be forgiven!'a "3

References for Mark 4:12