Isocrates 1.12, question about definite article

Greek Learning Greek
1

Isocrates 1.12, “To Demonicus”

οὕτω δὲ τὴν γνώμην οὐ δυνατὸν διατεθῆναι τὸν μὴ πολλῶν καὶ καλῶν ἀκουσμάτων πεπληρωμένον. . . .

What is the function of the definite article τὸν?

I can´t decide which word it goes with. One guess is that it makes substantive the final word of the snip, πεπληρωμένον, and encloses other words in the attributive position. But I can´t justify this.

The whole of 1.12 is here: Isocrates, To Demonicus, section 12

2

I’d say it can only go with πεπληρωμένον, which would be the subject of the secondary introduced by οὐ δυνατὸν

3

It’s not possible to have such mental disposition (lit. to be thus disposed in his γνώμη) for someone (τὸν, “the person”) not filled with many fine sayings. τὸν μὴ … πεπεληρωμένον the subject of the infinitive (μή making it conditional, “unless”).

4

Thanks to bedwere and mwh for the helpful commentary.