Question

who said liberty is opposite to our government

Answer 1

The correct statement is “Liberty is the opposite of over-government.”

The above statement was made by Sir John Robert Seeley in his book Introduction to Political Science – Two Series of Lectures. He was an English historian and essayist. Seeley is primarily known for his book The Expansion of England.

Answer 2

Well, the answer of your question is "John Robert Seeley".
And and the statement is not exact as the original which says 'liberty is the opposite of over-government". He says this in his book named as "introduction to political science" 
Sir Robert Seeley was actually the english analyst born in london. His one of the famous work is represented in the book named as  "Expansion of england" Which he wrote in the year of 1883 which was actually written as the historian.