You can move a lot of water with a thimble. – Martin H. Fischer (1879–1962)

Look at a stone cutter hammering away at his rock, perhaps a hundred times without as much as a crack showing in it. Yet at the hundred-and-first blow it will split in two, and I know it was not the last blow that did it, but all that had gone before. – Jacob A. Riis

As a means to success, determination has this advantage over talent — that it does not have to be recognized by others. – Robert Brault, rbrault.blogspot.com