How long will you wait to think yourself worthy of the highest and transgress in nothing the clear pronouncement of reason? You have received the precepts which you ought to accept, and you have accepted them. Why then do you still wait for a master, that you may delay the amendment of yourself till he comes? You are a youth no longer, you are now a full-grown man. If now you are careless and indolent and are always putting off, fixing one day after another as the limit when you mean to begin attending to yourself, then, living or dying, you will make no progress but will continue unawares in ignorance. Therefore make up your mind before it is too late to live as one who is mature and proficient, and let all that seems best to you be a law that you cannot transgress. And if you encounter anything troublesome or pleasant or glorious or inglorious, remember that the hour of struggle is come, the Olympic contest is here and you may put off no longer, and that one day and one action determines whether the progress you have achieved is lost or maintained. This was how Socrates attained perfection, paying heed to nothing but reason, in all that he encountered. And if you are not yet Socrates, yet ought you to live as one who would wish to be a Socrates.
A passage of stoicism. The grammar here seems kind of weird to me. What does it mean?