What are some good quotes from animal farm about utopia?

Consider the song Beasts of England. It is a rallying cry for animals:

“Beasts of England, beasts of Ireland,
Beasts of every land and clime,
Hearken to my joyful tidings
Of the golden future time.

Soon or late the day is coming,
Tyrant Man shall be o'erthrown,
And the fruitful fields of England
Shall be trod by beasts alone.

Rings shall vanish from our noses,
And the harness from our back,
Bit and spur shall rust forever,
Cruel whips shall no more crack.

Riches more than mind can picture,
Wheat and barley, oats and hay,
Clover, beans, and mangel-wurzels,
Shall be ours upon that day.

Bright will shine the fields of England,
Purer shall its water be,
Sweeter yet shall blow its breezes
On the day that sets us free.

For that day we all must labour,
Though we die before it break;
Cows and horses, geese and turkeys,
All must toils for freedom's sake.

Beasts of England, beasts of Ireland,
Beasts of every land and clime,
Hearken well and spread my tidings
Of the golden future time. ”
― George Orwell,

Why did the pigs in animal farm become what they hated?