What can mean this? Specially the red sentence.
[519b]and becoming, which attaching themselves to it by food and similar pleasures and gluttonies turn downwards the vision of the soul1—If, I say, freed from these, it had suffered a conversion towards the things that are real and true, that same faculty of the same men would have been most keen in its vision of the higher things, just as it is for the things toward which it is now turned.” “It is likely,” he said. “Well, then,” said I, “is not this also likely2 and a necessary consequence of what has been said, that neither could men who are uneducated and inexperienced in truth ever adequately
[519c] preside over a state, nor could those who had been permitted to linger on to the end in the pursuit of culture—the one because they have no single aim1 and purpose in life to which all their actions, public and private, must be directed, and the others, because they will not voluntarily engage in action, believing that while still living they have been transported to the Islands of the Blest.2” “True,” he said. “It is the duty of us, the founders, then,” said I, “to compel the best natures to attain the knowledge which we pronounced the greatest, and to win to the vision of the good,
[519b]and becoming, which attaching themselves to it by food and similar pleasures and gluttonies turn downwards the vision of the soul1—If, I say, freed from these, it had suffered a conversion towards the things that are real and true, that same faculty of the same men would have been most keen in its vision of the higher things, just as it is for the things toward which it is now turned.” “It is likely,” he said. “Well, then,” said I, “is not this also likely2 and a necessary consequence of what has been said, that neither could men who are uneducated and inexperienced in truth ever adequately
[519c] preside over a state, nor could those who had been permitted to linger on to the end in the pursuit of culture—the one because they have no single aim1 and purpose in life to which all their actions, public and private, must be directed, and the others, because they will not voluntarily engage in action, believing that while still living they have been transported to the Islands of the Blest.2” “True,” he said. “It is the duty of us, the founders, then,” said I, “to compel the best natures to attain the knowledge which we pronounced the greatest, and to win to the vision of the good,