Isaiah 19:22

19:22 The Lord will strike Egypt, striking and then healing them. They will turn to the Lord and he will listen to their prayers ¹  and heal them.

Matthew 13:15

13:15 For the heart of this people has become dull;

they are hard of hearing,

and they have shut their eyes,

so that they would not see with their eyes

and hear with their ears

and understand with their hearts

and turn, and I would heal them.’ ² 

[19:22]  ¹ tn Heb “he will be entreated.” The Niphal has a tolerative sense here, “he will allow himself to be entreated.”

[13:15]  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.