It is the smallest of all seeds, and yet it becomes the biggest tree.

Perhaps without your knowledge a word has fallen into your heart.

You are scarcely aware of it, you pass it by, but it grows secretly, and all at once enlightenment is there, and you have the Kingdom of Heaven.

Then, again, it is like yeast, and stirs up and changes your whole being.

The Kingdom of Heaven is like treasure hidden in a field.