Path to understanding

Matthew 13:12 Whoever has [understanding] will be given more, and he will have an abundance. Whoever does not have, even what he has will be taken from him. 13This is why I speak to them in parables: 
   “Though seeing, they do not see; 
      though hearing, they do not hear or understand. 14In them is fulfilled the prophecy of Isaiah: 
   ” ‘You will be ever hearing but never understanding; 
      you will be ever seeing but never perceiving. 
 15For this people’s heart has become calloused; 
      they hardly hear with their ears, 
      and they have closed their eyes. 
   Otherwise they might see with their eyes, 
      hear with their ears, 
      understand with their hearts 
   and turn, and I would heal them.