The very first requirement in a hospital is that it should do the sick no harm.
Florence NightingaleIf we did not flatter ourselves, the flattery of others could never harm us.
Francois de La RochefoucauldThat which is unjust can really profit no one; that which is just can really harm no one.
Henry GeorgeCats seem to go on the principle that it never does any harm to ask for what you want.
Joseph Wood KrutchYour own mind is a sacred enclosure into which nothing harmful can enter except by your permission.
Arnold Bennett