For Example: "Go confidently in the direction of your dreams. Live the life you've imagined." - Henry David Thoreau
International Law Attorney
I see no problem using a quote from a long dead person like Thoreau. Living individuals' quotes or trademarked slogans however would not be a good idea.
"It is right and proper to quote what we do not comprehend in a language we least understand."
Voltaire in Micromegus