what is collectivist mantras are presented in this first chapter

Check out the first words of Chapter 1,

"It is a sin to write this. It is a sin to think words no others think and to put them down upon a paper no others are to see..."

Then we are presented with other mantras which, I suppose, if you say them enough times become your reality,

"We are one in all and all in one.

There are no men but only the great WE,

One, indivisible and forever."

The running theme here is that there is no separate identity rather than a mass of collective identity.

Then there is the ever popular,

"We are nothing. Mankind is all. By the grace of our brothers are we allowed our lives. We exist through, by and for our brothers who are the State. Amen."