Bible Verses About Reproof: Not understanding

Do ye not yet perceive, neither remember the five loaves of the five thousand, and how many baskets ye took up?

How is it that ye do not perceive that I spake not to you concerning bread? But beware of the leaven of the Pharisees and Sadducees.

And he saith unto them, Are ye so without understanding also? Perceive ye not, that whatsoever from without goeth into the man, it cannot defile him;

And he said unto them, O foolish men, and slow of heart to believe in all that the prophets have spoken!

Why do ye not understand my speech? Even because ye cannot hear my word.

Jesus answered and said unto him, What I do thou knowest not now; but thou shalt understand hereafter.

Peter saith unto him, Thou shalt never wash my feet. Jesus answered him, If I wash thee not, thou hast no part with me.