Jesus spoke of the Kingdom of Heaven as being like the leaven in dough that, though small, can grow and take over the whole measure of flour. Our hearts can grow with the love of God, but sometimes they get frozen. Let yours grow, and perhaps use the pope's new encyclical on devotion to the Sacred Heart to help.
Based on Luke 13:18-21
Jesus said, ‘What is the kingdom of God like? And to what should I compare it? It is like a mustard seed that someone took and sowed in the garden; it grew and became a tree, and the birds of the air made nests in its branches.’
And again he said, ‘To what should I compare the kingdom of God? It is like yeast that a woman took and mixed in with three measures of flour until all of it was leavened.’
(New Revised Standard Version Bible: Anglicized Edition, copyright © 1989, 1995 National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved worldwide. http://nrsvbibles.org)
See all the Word of Hope videos at http://opcentral.org/hope