Religion? Hinduism features a social caste system
Rene Decartes was a French philosopher born in 1596 a time when many long held benefits where changing. His new way of thinking led him to decide to doubt everything until he could prove it. His goal was to achieve certainity through methodical and logical questioning.
It was "D. The Code of Hammurabi" that recorded a set of laws for a society, since it was thought that if common laws were made known and placed in public, then more people would follow them.
A President can employ a number of strategies to ensure the successful confirmation of a Supreme Court nominee.
The first is a careful and intense vetting process beforehand to ensure that there are no hidden traps that might derail the nomination.
The second is to employ a legislative "sherpa" to introduce the nominee around the Senate. This is often a former senator who has excellent relations with the other senators and who can vouch for the character and background of the nominee before the Senate.