http://bible.cc/john/12-20.htm
Romans 9:18 So then He has mercy on whom He desires, and He hardens whom He desires.
Mark 4:1Again Jesus began to teach by the lake. The crowd that gathered around him was so large that he got into a boat and sat in it out on the lake, while all the people were along the shore at the waters edge. 2He taught them many things by parables, and in his teaching said: 3Listen! A farmer went out to sow his seed. 4As he was scattering the seed, some fell along the path, and the birds came and ate it up. 5Some fell on rocky places, where it did not have much soil. It sprang up quickly, because the soil was shallow. 6But when the sun came up, the plants were scorched, and they withered because they had no root. 7Other seed fell among thorns, which grew up and choked the plants, so that they did not bear grain. 8Still other seed fell on good soil. It came up, grew and produced a crop, multiplying thirty, sixty, or even a hundred times.
9Then Jesus said, He who has ears to hear, let him hear.
The secret of the kingdom of God has been given to you. But to those on the outside everything is said in parables
12so that,
they may be ever seeing but never perceiving,
and ever hearing but never understanding;
otherwise they might turn and be forgiven!