Words may be either the ...

Words may be either the servants or masters. If the former they may safely guide us in the way of truth. If the latter they intoxicate the brain and lead into swamps of thought where there is no solid footing. Among the sources of those innumerable calamities which from age to age have overwhelmed mankind, may be reckoned as one of the principal, the abuse of words.
 George Horne

Quotes from the same author

It is expedient to have acquaintance with those who have looked into the world, who know men, understand business, and can give you good intelligence and good advice when they are wanted.
 George Horne