"We are one in all and all in one. There are no men but only the great WE, One, indivisible and forever."
"We shall not report our find to the City Council. We shall not report it to any men"
This decision affects the plot because here, Equality starts to rebel against the rules.
Equality starts off as someone who tries to blend in with the rest of society and is afraid to be different. After the discovery of the tunnel, Equality becomes more independent and also becomes his "own person".
Equality is a complex character because he changes throughout the book.
In the beginning of the story, Equality 7-2521 is repressed by the society he lives in. Everyone is supposed to the the same, and united. They can't have anything of their own. He's always been "different", but is always told its a bad thing. He tries to act just like everyone else.
After given a job as a street sweeper by the council, Equality and another person he works with, International, find a tunnel from the "unmentionable times". Equality tells International to not report it to the council, and decided to make it his own place, despite of it being against the rules. This is where we start to see a change in Equality.
Apart from finding the tunnel, he also meets Liberty, whom he has feelings for. This is against their laws. Equality also makes progress in his tunnel and recreates a light bulb. This shows that Equality is starting to become an "individual". He even wants to show the council/scholars his creation.