Malchut of Gevurah - Nobility in Discipline. If you need to correct someone, do so in a way that fosters the person’s self-respect.
Maimonides wrote "When one rebukes his fellow, whether in matters between the two of them or in matters between him [the sinner] and G-d (lit., 'the Omnipresent'), he must rebuke him privately (lit., 'between him and himself'). He should speak to him gently, in a soothing (lit., 'soft') tone, telling him that he is only saying this to him for his benefit and to bring him to the life of the World to Come." [See more here.]
Maimonides wrote "When one rebukes his fellow, whether in matters between the two of them or in matters between him [the sinner] and G-d (lit., 'the Omnipresent'), he must rebuke him privately (lit., 'between him and himself'). He should speak to him gently, in a soothing (lit., 'soft') tone, telling him that he is only saying this to him for his benefit and to bring him to the life of the World to Come." [See more here.]