"All rivers, small or large, agree in one character; they like to lean a little on one side; they cannot bear to have their channels deepest in the middle, but will always, if they can, have one bank to sun themselves upon, and another to get cool under; one shingly shore to play over, where they may be shallow, and foolish, and childlike; and another steep shore, under which they can pause and purify themselves, and get their strength of waves fully together for due occasions. 

Rivers in this way are just like wise men, who keep one side of their life for play, and another for work; and can be brilliant, and chattering, and transparent when they are at ease, and yet take deep counsel on the other side when they set themselves to the main purpose." 

John Ruskin.