The best way to prove the clearness of our mind, is by showing its faults; as when a stream discovers the dirt at the bottom, it convinces us of the transparency and purity of the water.
When we cast our bread upon the waters we can presume that someone downstream whose face we will never know will benefit from our action, as we who are downstream from another will profit from the grantor's gift.
Highest good is like water. Because water excels in benefiting the myriad creatures without contending with them and settles where none would like to be, it comes closest to the way.
As muddy water is best cleared by leaving it alone, it could be argued that those who sit quietly and do nothing are making one of the best possible contributions to a world in turmoil.