Jesus spoke these parables: 

 The kingdom of heaven is like a mustard seed
 It is the least of all the seeds; 
 but when it is grown it . . .becomes a tree,
 so that birds come and nest in its branches.

 The kingdom of heaven is like leaven,
 which a woman took and hid in three 
measures
 of meal till it was all leavened.

 The kingdom of heaven is like treasure
 hidden 
in a field, which a man found and hid;
 and for joy over it he 
goes and sells
 all that he has and buys that field.

                               --- Matthew 13:31-44