I warmly appreciate your kind message of congratulation which has given me a great deal of pleasure, and sincerely wish that it were possible for me to acknowledge it in a less formal manner.
An engraved form of thanks for sympathy, also from one in public life, is presented in the following example:
Mr. John Smith
wishes to express his deep gratitude
and to thank you
for your kind expression of sympathy
But remember: an engraved card sent by a private individual to a personal friend, is not "stylish" or smart, but rude. (See also engraved acknowledgment of sympathy, pages 406-7.)
A letter of business introduction can be much more freely given than a letter of social introduction. For the former it is necessary merely that the persons introduced have business interests in common—which are much more easily determined than social compatibility, which is the requisite necessary for the latter. It is, of course, proper to give your personal representative a letter of introduction to whomever you send him.
On the subject of letters of social introduction there is one chief rule: