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.’ 1 

Matthew 27:64

27:64 So give orders to secure the tomb until the third day. Otherwise his disciples may come and steal his body 2  and say to the people, ‘He has been raised from the dead,’ and the last deception will be worse than the first.”

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 Grk “him.”