To "affirm shared values" is to ensure that

People are happy, excited, Give people reason to care and most of all clarify your values.

I know this is a late answer. but I thought why not anyway.

Montag has to memorize Ecclesiastes and Revelation because  they are the most symbolic books in the Bible in relation to this novel. Ecclesiastes is symbolic because its title means "to gather." Granger, Montag, and The Book People at the end must all gather.  I hope my answer has come to your help. God bless and have a nice day ahead!