Book VI, lines 183–189; Odysseus to Nausicaa.
Translations, Odyssey (2000)
“And may the gods accomplish your desire:
a home, a husband, and harmonious
converse with him – the best thing in the world
being a strong house held in serenity
where man and wife agree. Woe to their enemies,
joy to their friends! But all this they know best.”
VI. 180–185 (tr. Robert Fitzgerald); Odysseus to Nausicaa.
Odyssey (c. 725 BC)
Original
Σοὶ δὲ θεοὶ τόσα δοῖεν, ὅσα φρεσὶ σῇσι μενοινᾷς, ἄνδρα τε καὶ οἶκον, καὶ ὁμοφροσύνην ὀπάσειαν ἐσθλήν· οὐ μὲν γὰρ τοῦ γε κρεῖσσον καὶ ἄρειον, ἢ ὅθ' ὁμοφρονέοντε νοήμασιν οἶκον ἔχητον ἀνὴρ ἠδὲ γυνή· πόλλ' ἄλγεα δυσμενέεσσι, χάρματα δ' εὐμενέτῃσι· μάλιστα δέ τ' ἔκλυον αὐτοί.
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Homér 217
Ancient Greek epic poet, author of the Iliad and the OdysseyRelated quotes

“Your Worst Enemy Could Be Your Best Friend && Your Best Friend Your Worst Enemy”

Translated by Mary Jacob[citation needed]
It is unlikely that this poem, translated by Mary Jacob, is authored by Han-shan. In comparing it with every poem in the corpus it will be found that there is not a close match. Moreover, neither the language nor the content of this poem is that of Han-shan. Most importantly, this poem does not have the appropriate number of lines for a Han-shan poem. Jacob's poem has 9 lines; there is not a single example of a 9 line poem in all of Han-shan's poetry. All of Han-shan's poems are 4, 8, 10 or 14 lines, with a few that have more than 14. Further, Jacob's poem has an odd number of lines; there is not a single example of a poem with an odd number of lines in all of Han-shan's poetry. Finally, the 9th and final line in Jacob's poem has the words “ha ha ha.” Not a single Han-shan poem has those words as a final line. Perhaps someone is having a joke?
Disputed

“Understand that some of your enemies are amongst your best friends.”
Diary of an Unknown (1988)
Posies for a Parlour, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

[Swami Tapasyananda, Swami Nikhilananda, Sri Sarada Devi, the Holy Mother; Life and Conversations, 349]

Source: 1800s, Auguries of Innocence (1803), Line 56. Compare Psalm 30:5 (KJV): "weeping may endure for a night, but joy cometh in the morning."