Great events ever depend but upon a single hair. The adroit man profits by everything, neglects nothing which can increase his chances; the less adroit, by sometimes disregarding a single chance, fails in everything.
Don't trust children with edge tools. Don't trust man, great God, with more power than he has until he has learned to use that little better. What a hell we should make of the world if we could do what we would!
Steam becomes a mighty power only when it allows itself to be imprisoned in a strong little reservoir, produces tremendous motion and carries huge weights by permitting itself a tiny and measured outlet.