Hold their noses to the grindstone.

I smell a rat.

'Tis slight, not strength, that gives the greatest lift.

From thousands of our undone widows One may derive some wit.

There is absolutely no substitute for hard work.

Useful undertakings which require sustained attention and vigorous precision in order to succeed often end up by being abandoned, for, in America, as elsewhere…

Concentrate all your thoughts upon the work at hand. The sun's rays do not burn until brought to a focus.