However powerful a yogi may be, he cannot expand himself into more than eight or nine forms. The Supreme Personality of Godhead, however, can expand Himself into millions of forms, ananta-rupa - innumerable, countless forms

Expressions researched:
"however powerful a yogī may be, he cannot expand himself into more than eight or nine forms. The Supreme Personality of Godhead, however, can expand Himself into millions of forms, ananta-rūpa—innumerable, countless forms—as stated in the Brahma-saṁhitā"

SB Canto 3

As the Supreme Personality of Godhead can expand Himself in millions of forms, a yogī can also expand up to nine forms, but not more than that. Another example is that of Saubhari Muni; he also expanded himself into eight forms. But however powerful a yogī may be, he cannot expand himself into more than eight or nine forms. The Supreme Personality of Godhead, however, can expand Himself into millions of forms, ananta-rūpa—innumerable, countless forms—as stated in the Brahma-saṁhitā. No one can compare to the Supreme Personality of Godhead by any conceivable energetic manifestation of power.

SB 3.23.44, Translation and Purport:

After coming back to his hermitage, he divided himself into nine personalities just to give pleasure to Devahūti, the daughter of Manu, who was eager for sex life. In that way he enjoyed with her for many, many years, which passed just like a moment.

Here the daughter of Svāyambhuva Manu, Devahūti, is described as suratotsuka. After traveling with her husband all over the universe, in Mount Meru and the beautiful gardens of the heavenly kingdoms, she naturally became sexually stimulated, and in order to satisfy her sexual desire, Kardama Muni expanded himself into nine forms. Instead of one, he became nine, and nine persons had sexual intercourse with Devahūti for many, many years. It is understood that the sexual appetite of a woman is nine times greater than that of a man. That is clearly indicated here. Otherwise, Kardama Muni would have had no reason to expand himself into nine. Here is another example of yogic power. As the Supreme Personality of Godhead can expand Himself in millions of forms, a yogī can also expand up to nine forms, but not more than that. Another example is that of Saubhari Muni; he also expanded himself into eight forms. But however powerful a yogī may be, he cannot expand himself into more than eight or nine forms. The Supreme Personality of Godhead, however, can expand Himself into millions of forms, ananta-rūpa—innumerable, countless forms—as stated in the Brahma-saṁhitā. No one can compare to the Supreme Personality of Godhead by any conceivable energetic manifestation of power.