'Understand' in the Bible

'Because of this, in similes do I speak to them, because seeing they do not see, and hearing they do not hear, nor understand,

and fulfilled on them is the prophecy of Isaiah, that saith, With hearing ye shall hear, and ye shall not understand, and seeing ye shall see, and ye shall not perceive,

for made gross was the heart of this people, and with the ears they heard heavily, and their eyes they did close, lest they might see with the eyes, and with the ears might hear, and with the heart understand, and turn back, and I might heal them.

Jesus saith to them, 'Did ye understand all these?' They say to him, 'Yes, sir.'

And having called near the multitude, he said to them, 'Hear and understand:

do ye not understand that all that is going into the mouth doth pass into the belly, and into the drain is cast forth?

do ye not yet understand, nor remember the five loaves of the five thousand, and how many hand-baskets ye took up?

how do ye not understand that I did not speak to you of bread -- to take heed of the leaven of the Pharisees and Sadducees?'