"If the Son sets you free, you will be free indeed” (John 8:36)
The following is from GotQuestions.org:
How can we experience true freedom in Christ?
Everyone seeks freedom. Especially in the West, freedom is the highest virtue, and it is sought after by all who are, or consider themselves to be, oppressed. But freedom in Christ is not the same as political or economic freedom. In fact, some of the most harshly oppressed people in history have had complete freedom in Christ. The Bible tells us that, spiritually speaking, no one is free. In Romans 6, Paul explains that we are all slaves. We are either slaves to sin or slaves to righteousness. Those who are slaves to sin cannot free themselves from it, but once we are freed from the penalty and power of sin through the cross, we become a different kind of slave, and in that slavery we find complete peace and true freedom.
Although it seems like a contradiction, the only true freedom in Christ comes to those who are His slaves. Slavery has come to mean degradation, hardship, and inequality. But the biblical paradigm is the true freedom of the slave of Christ who experiences joy and peace, the products of the only true freedom we will ever know in this life. There are 124 occurrences in the New Testament of the word doulos, which means “someone who belongs to another” or “bondslave with no ownership rights of his own.” Unfortunately, most modern Bible versions, as well as the King James Version, most often translate doulos as “servant” or “bond-servant.” But a servant is one who works for wages, and who, by virtue of his work, is owed something from his master. The Christian, on the other hand, has nothing to offer the Lord in payment for his forgiveness, and he is totally owned by the Master who bought him with His shed blood on the cross. Christians are purchased by that blood and are the possession of their Lord and Savior. We are not hired by Him; we belong to Him (Romans 8:9; 1 Corinthians 7:4). So “slave” is really the only proper translation of the word doulos.