Markus 2:17

2:17 When Jesus heard this he said to them, “Those who are healthy don’t need a physician, but those who are sick do. ¹  I have not come to call the righteous, but sinners.”

Markus 4:12

4:12 so that although they look they may look but not see,

and although they hear they may hear but not understand,

so they may not repent and be forgiven.” ² 

[2:17]  ¹ sn Jesus’ point is that he associates with those who are sick because they have the need and will respond to the offer of help. A person who is healthy (or who thinks mistakenly that he is) will not seek treatment.

[4:12]  ² sn A quotation from Isa 6:9-10. Thus parables both conceal or reveal depending on whether one is open to hearing what they teach.