Mark 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.” ¹ 

Mark 8:17

8:17 When he learned of this, ²  Jesus said to them, “Why are you arguing ³  about having no bread? Do you still not see or understand? Have your hearts been hardened?

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¹ 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.

² tn Or “becoming aware of it.”

³ tn Or “discussing.”