Was it a collection of quotes or just the one portion? Whatever it was there is little that one could take issue with. I believe the writer recognises the existence of God's Law and that all things in the universe must comply with that Law or perish.
It is the degree to which each creature complies with the Law that defines its freedom. If one's nature is such that obedience to the Law is simply a matter of one's nature then one is perfectly free. If one does intuitively and instinctively what the Law demands then one is acting with complete freedom.
The condition of mankind at the present time is that we are unable to obey the Law of God by nature. Our natural mind is hostile to the Law of God. We are in our very essence in rebellion against our Creator. We can recognise that His Law is good and just but we find that we cannot do as it commands. We always fall short.
This condition is known as sin which can mean either missing the mark or lawlessness. We are born in this condition and we live under the curse that this condition has brought upon us all. The curse is bondage to sin and to the earth to which we must apply our labour in order to earn our bread. This is the permanent condition of every man on Earth past present and future. Woman has a different burden to bear but no less onerous.
Is it any surprise then that we love the idea of Liberty? It is a dream that has haunted mankind for as long as there has been an Earth and men walking on it. It is this condition that the Lord Jesus Christ, the one and only Son of God, came to Earth from Heaven to deal with. He came to set the captives free. The situation is a legal one...we are lawbreakers...and therefore it requires a legal solution. We are debtors to the Law and to the Lawgiver and He has graciously provided a means for us to be relieved of our debt. He asks us to recognise the diagnosis and to accept the remedy. In its simplest form this is the eternal Gospel, the Evangel, the Good News.
This means that rather than being slaves to sin we become slaves to righteousness and we set out on a course of learning how to be real human beings, in preparation not for Heaven, as is commonly taught, but for rulership of the Creation as sons of God in the Kingdom of God just as the forerunner, the firstborn of many brethren, the Lord Jesus Christ taught us. This purpose of our Father is clearly set out in the very first book of the Bible when He said "Let us make Man in our image, after our likeness, so they may rule over the fish of the sea and the birds of the air, over the cattle, and over all the earth, and over all the creatures that move on the earth.”
This mandate to rule has been increased by the work done by our Lord Jesus Christ in whom and in whom alone we can receive our inheritance. Now He has said “All authority in heaven and on earth has been given to me." Since He is the firstborn over all Creation He has received the double portion according to the law of inheritance and He shares that inheritance with his co-heirs, all those who believe in and follow Him.
"Jesus answered them: 'Truly, truly, I say to you, everyone who commits sin is a slave to sin. The slave does not remain in the house forever; the son remains forever. So if the Son sets you free, you will be free indeed.'" (John 8:34-36)