You have to grow from inside out. None can teach you, none can make you spiritual. There is no other teacher but your own soul.
Did Vivekananda say "You have to grow from the inside..."?
In his words
Yes. Swami Vivekananda said this in Sayings and Utterances (Complete Works, vol 5). It is in Sayings and Utterances, a list of his sayings compiled in vol 5. The shared version adds "the" before "inside out". The line is no. 20 in Sayings and Utterances (vol 5), a compiled list. The lecture behind it, The Ideal of a Universal Religion (vol 2), says: "There is no other teacher to you than your own soul."
The version people share
“You have to grow from the inside out. None can teach you, none can make you spiritual. There is no other teacher but your own soul.”
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What he said
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Also in his words
“There is no other teacher to you than your own soul.” Complete Works vol 2, The Ideal of a Universal Religion.
More in his words
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Is "You have to grow from the inside..." in the Complete Works of Swami Vivekananda?
Yes. Swami Vivekananda said this in Sayings and Utterances (Complete Works, vol 5). It is in Sayings and Utterances, a list of his sayings compiled in vol 5.
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 98.