I agree. For example when looking at the Elizabethan Era poets, playwrights, and authors wrote about issues and events that pertained to what was going on during that time. The event shown in their pieces shows people of this generation how people thought during that time and how they handle different situations. The same goes for culture. Looking at work from a generation shows how times have changed and how humans have changed.
Basically twice means 2 in these sentence twice means more than he earn in short words he wants to say that he wants to earn more than he is earning now
for example someone is earning $500 every month so he want to earn $1000 every month
