The “parable of the mustard seed” is something of a prophecy of the tremendous expansion of the church. From a seemingly insignificant group of believers in Jerusalem, it grew to embrace millions of people. Today it is a worldwide fellowship including believers from almost all nations, races, and languages. This is exciting, but equally exciting is the fact that the kingdom of God has the power to continue growing. Certain unbelievers delight in thinking of this as a “post-Christian era.” They suggest that the time may be near when the human race casts off the shackles of religion. But the seed of the kingdom, the Word of God, contains the same potential for growth as it did in the first centuries of Christianity. We simply need to keep on sowing it. We should not be too hasty in giving up on any unbeliever. Instead, we must pray for that individual, for the Christians with whom he has contact, and for ourselves whenever we have the opportunity to demonstrate our faith to him.
“Well did Isaiah prophesy of you hypocrites, as is written:
‘This people honors Me with their lips,
But their heart is far from Me.
And in vain they worship Me,
Teaching as doctrines the commandments of men.’
For laying aside the commandment of God, you hold the tradition of men–the washing of pitchers and cups, and many other such things you do. All too well you reject the commandment of God, that you may keep your tradition. For Moses said, ‘Honor your father and your mother’; and, ‘He who curses father or mother, let him be put to death.’ But you say, ‘If a man says to his father or mother, “Whatever profit you might have received from me is Corban”–‘ (that is, a gift to God), then you no longer let him do anything for his father or his mother, making the word of God of no effect through your tradition which you have handed down. And many such things you do.”
Mark 7:6-13 (NKJV)