People look like rivers very much: water is everywhere the same, but the rivers are narrow, fast, wide, pure, cold, muddy and warm. The people are the same. They have the rudiment of every human habit in them and they behave according to them. Sometimes they even do not look like themselves, but they still stay whatever they are.
As I turned away, I saw Holmes, with his back against a rock and his arms folded, gazing down at the rush of the waters. It was the last that I was ever destined to see of him in this world. - Watson.
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.
As the different streams, having their sources in different places, all mingle their water in the sea; O Lord, so the different paths which men take through different tendencies, various though they appear, crooked or straight, all lead to Thee.