Take up one idea. Make that one idea your life, think of it, dream of it, live on that idea
Did Vivekananda say "Take up one idea. Make that one..."?
In his words
Yes. Swami Vivekananda said this in Pratyahara and Dharana (Complete Works, vol 1).
The version people share
“Take up one idea. Make that one idea your life; think of it, dream of it, live on that idea.”
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What he said
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More in his words
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Is "Take up one idea. Make that one..." in the Complete Works of Swami Vivekananda?
Yes. Swami Vivekananda said this in Pratyahara and Dharana (Complete Works, vol 1).
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 100.