Acts 7:13

‘And at the second time Joseph was made known to his brothers, and Joseph's race became openly made known to Pharaoh.'

But their fathers had not remained in blindness. At the second opportunity, (the opportunity that the Sanhedrin was now experiencing), the tribal leaders had had their eyes opened. Joseph was made known to his brothers. And Joseph's race (the source from which he came) was made openly known to Pharaoh, while Israel's eyes were opened to their deliverer and became familiar with, and reconciled with, the ‘foreign' influences which they had previously not recognised.

The call here was for the Sanhedrin to recognise their prospective Saviour, and open themselves to His seemingly ‘foreign' teaching.