“Drops of water turn a mill – singly none, singly none”

As my friends post notices that they voted, my thoughts keep returning to the Pete Seeger song “Step By Step”, from his 1998 album “If I Had a Hammer – Songs of Hope and Struggle”:

 Step by step, the longest march
 Can be won, can be won
 Many stones can form an arch
 Singly none, singly none

 And by union what we will
 Can be accomplished still
 Drops of water turn a mill
 Singly none, singly none

  
https://youtu.be/Fcw-Dgjid20 

Step by Step