What is the difference between mea and mihi?
"Mea" is a possessive adjective, like "my". "Me" and "mihi" are possessive pronouns, similar in meaning to "me" (direct object) and "to me" (indirect object). The only thing is, you don't always use "mihi" in Latin when you use "to me" in English, and the Latin "me" doesn't always match the English "me".
What does Videtur quod non mean?
In the middle ages, scholars often began their debates and expositions with the formula: videtur quod non,meaning, “it would appear that such and such is not true.” Thus, the scholars defended their thesis in 2 steps.