Faith that is weak is like muddy water, while faith that is brave is like clear water.

Buddhism Day by Day

Wisdom for Modern Life by Daisaku Ikeda
Wednesday, May 15, 2013:

 

When water is clear, the moon is reflected. When the wind blows, the trees shake. Our minds are like the water. Faith that is weak is like muddy water, while faith that is brave is like clear water. Understand that the trees are like principles, and the wind that shakes them is like the recitation of the sutra. -Nichiren