Be just and truthful, avoiding any stereotyped form in letters of
introduction. Never give a letter of introduction unless you have
entire confidence in the person to whom it is given; it may reflect
on your character or be used against you. Be very guarded that no
expressions may be construed into a letter of credit, thus making the
writer liable for payment. Use no unfounded statements or assertions,
over-estimating your friend, as these may prove untrue.
Willing to extend a favor to a friend by giving a letter of
introduction, do not be guilty of introducing him to any one in whom
he may not place confidence, as he might be a loser by such.