Who Said It: @JoseCanseco or Gertrude Stein?

Gertrude Stein is emblematic of a literary and artistic era, with the rhythmic cadence of her poetry underlining a naked self-expression.
Jose Canseco slugged 462 dingers and is now known on Twitter for his candid insight, bouts of oppressive confidence tempered by poignant disclosures of self doubt, and an ever-turbid relationship with the ethereal but "so hot" Leila Shennib ("Leila please call me").

Can you decipher which of these phrases are lines from Stein's writing, and which are tweets from @JoseCanseco?