There are several ways in which humanists' studies and ideas affected the renaissance life, but the main way was that they put the focus on the person, not a God.
I believe it was there religion or they didn't like change and thought strength was best for everything.
A theme is a history surrounding it or a repeating moment, a period is a time that the themes were set in. hope this helps P
The Romans wanted to be connected to or tied to ancient Greece and its heroes