Matius 26:43

26:43 He came again and found them sleeping; they could not keep their eyes open. ¹ 

Matius 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 

[26:43]  ¹ tn Grk “because their eyes were weighed down,” an idiom for becoming extremely or excessively sleepy (L&N 23.69).

[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.