The rules that I shall ...

The rules that I shall propose concerning secrecy, and from which I think it not safe to deviate without long and exact deliberation, are, never to solicit the knowledge of a secret,--not willingly, nor without many limitations, to accept such confidence when it is offered; when a secret is once admitted, to consider the trust as of a very high nature, important as society and sacred as truth, and therefore not to be violated for any incidental convenience, or slight appearance of contrary fitness.
The rules that I shall propose concerning secrecy, and from which I think it not safe to deviate without long and exact deliberation, are, never to solicit the knowledge of a secret,--not willingly, nor without many limitations, to accept such confidence when it is offered; when a secret is once admitted, to consider the trust as of a very high nature, important as society and sacred as truth, and therefore not to be violated for any incidental convenience, or slight appearance of contrary fitness.

Quotes from the same author

If a man does not make new acquaintances as he advances through life, he will soon find himself left alone. A man, sir, should keep his friendship in a constant repair.
To keep your secret is wisdom; but to expect others to keep it is folly.
Love is the wisdom of the fool and the folly of the wise.
Memory is the mother of all wisdom.
Friendship, like love, is destroyed by long absence, though it may be increased by short intermissions.