Luke 13, 18-21

He went on to say, ‘What is the kingdom of God like? What shall I compare it with?  It is like a mustard seed which a man took and threw into his garden: it grew and became a tree, and the birds of the air sheltered in its branches.’  Again he said, ‘What shall I compare the kingdom of God with?  It is like the yeast a woman took and mixed in with three measures of flour till it was leavened all through.’