Vedantasara - Verse 123
Sanskrit
अतिप्राकृतस्तु “आत्मा वै जायते पुत्रः” इत्यादिश्रुतेः स्वस्मिन्निव पुत्रेऽपि प्रेमदर्शनात्पुत्रे पुष्टे नष्टे चाहमेव पुष्टो नष्टश्चेत्याद्यनुभवाच्च पुत्र आत्मेति वदति
Swami Nikhilananda's Translation
(Thus for example) an extremely deluded man speaks of his son as his own Self, on account of such Sruti passages as, “Verily the Self is born as the son,” owing also to the fact that one loves one’s son as one’s own Self, and further because of the experience that one feels oneself prosperous or ruined according as one’s son fares well or ill.
Index: Vedantasara

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