The added 'forme' is highly metaphysical. The implied meaning that I am insinuating almost 200 years after Charles Caleb Colton's death is partially Plutonic more-or-less Aristotelian; 'o sepi to poli'.
Excellence is something that can't be seen by any other person, or without anyone else. It is something that must be found in the psyche, in the heart. You can just discover this excellence by experience.