Jesus also told the people, that if the heart of a man was not full of faith and love, it would be as impossible for him to do anything pleasing to God, as it would be for a bad tree to bring forth good fruit; for the quality of the tree is known by its fruits; and the heart of man is known by his conduct and actions. Certain of the Scribes and Pharisees, asked Jesus to give them a sign of His being indeed the Son of God. This was displeasing to the Lord, for His miracles were a sufficient sign of His having come from Heaven; and from the writings of their own prophets, the Jews should have understood, that the promised Messiah whilst on earth would be in a humble condition, and be finally put to death for the sins of His people. Jesus therefore told the Scribes and Pharisees, that no further sign of His being the Messiah would be given, than the sign of the prophet Jonas, or Jonah. "For as Jonas was three days and three nights in the whale's belly, so shall the Son of Man be three days and three nights in the heart of the earth." The meaning of this was, that the only further sign they could expect as to His being the Messiah, would be that one, of which Jonas was a type (or sign): for that as Jonas, though buried in the whale's body, came out alive; so He would be buried in the ground for three days, and then rise up again to live for ever. Then Jesus took occasion to show the Pharisees, that they were more sinful in the eyes of God than the men of Nineveh, "because _they_ repented at the preaching of Jonas," whilst the Scribes and Pharisees refused to listen to Him, who was far greater than Jonas. Many other things Jesus said unto the people, teaching them also by parables. One parable spoken at this time was that of the Sower. Afterwards, when they were alone, the disciples asked Jesus the meaning of this parable, which He immediately explained: teaching them that many may hear the Gospel, and receive no benefit from it; either because they listen carelessly; or because, having listened, they have not faith to hold its doctrines fast when temptations and trials come; or because they allow the cares and pleasures of life to take up too much of their hearts, and so prevent their serving God properly. None of these will be the better for hearing the Word: but those who listen to it with a sincere and honest intention of obeying it, and pray to God for grace to do so, striving at the same time to root out all those sinful feelings and passions which, like stones and thorns, prevent their bringing forth the fruit of good works; those, and those only, will bear fruit pleasing unto the Lord. Let us learn from this parable to listen attentively to the Word of God, and try to do whatever it bids us.