We are what our thoughts have made us; so take care of what you think. Words are secondary. Thoughts live, they travel far.
Did Vivekananda say "Talk to yourself once in a day..."?
Not in his works
No. "Talk to yourself once in a day, otherwise you may miss meeting an excellent person in this world." does not appear in Swami Vivekananda's Complete Works. Searched vols 1 to 8 with a fuzzy match, and Wikisource (all volumes, including vol 9) by phrase. No passage comes close.
The version people share
“Talk to yourself once in a day, otherwise you may miss meeting an excellent person in this world.”
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Lines he did say
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Is "Talk to yourself once in a day..." in the Complete Works of Swami Vivekananda?
No. We searched volumes 1 to 8 with a fuzzy match and Wikisource across all nine volumes by phrase. Nothing comes close.
How do you check a Vivekananda quote?
Search a distinctive phrase in the Complete Works (Advaita Ashrama, nine volumes; the text is on ramakrishnavivekananda.info and Wikisource). If only quote sites carry it, with no volume or lecture named, treat it as unverified.
Sources and method
Matched against The Complete Works of Swami Vivekananda, Mayavati Memorial Edition, vols 1 to 8 (9,239 paragraphs, Bengali translations checked separately), with Python difflib. In his words: 90 or more out of 100. Paraphrase: 70 to 90. Not in his works: under 70, and no hit in a phrase search of Wikisource across all volumes, including vol 9. This line scored 52.