I met a sentence from Xenophon (maybe adapted):
Ἐπεὶ Σωκράτης τοῖς φίλοις διελέγετο, παρὼν δέ τις Ἀπολλόδωρος θαυμάζων ἰσχυρῶς αὐτόν· “Ἀλλὰ τοῦτο ἔγωγε,” ἔφη, “ὦ Σώκρατες, χαλεπώτατα φέρω, ὅτι ὁρῶ σε ἀδίκως ἀποθνῄσκοντα.”
I’m not sure about the “τοῦτο”. Maybe it is used to emphasize, means “It is me that…”?