see into

verb (intr, preposition)

1. to examine or investigate
2. to discover the true nature ofI can’t see into your thoughts

1Investigate; see look into. 2Understand the true character or nature of, as in Mother could see into Mary very well and knew exactly what she was up to. Shakespeare used this idiom in 2 Henry VI (3:1): “Well hath your Highness seen into this duke.”