Paul established churches in Galatia based upon grace - everything God has done to make us righteous through Jesus, leaving us nothing to do but to place our faith in Jesus alone for righteousness.
The Galatian people, after hearing the good news from Paul that righteousness (innocent of sin) comes by faith in Jesus and not by the law, quickly deserted the good news of grace and turned to a completely different gospel, or message about how a person becomes righteous.
The false gospel they were turning to was a gospel of works based upon obedience to the law of Moses (a moral and religious system).
An often quoted verse from the Bible is "We walk by faith, not by sight."
This verse is found in 2 Corinthians 5:7.
It is commonly quoted when people are going through difficult times and are suffering as a result.
In these difficulties, they use this verse to declare their dependence upon God, even though they may see problems or be suffering in pain.
By quoting this verse, they are demonstrating their trust in the goodness of God, even though they are in the worst of situations.
Trusting God in the difficulties of life is biblical when we can’t escape the pain or find a solution to the problem.
The law is the righteous requirements given to the nation of Israel to keep them seperate from the Gentile nations for the purpose of being a light of God's love to the Gentile nations. The law was the standard of righteousness.
This would include the Ten Commandments and the two great commandments to love God with all your heart, soul, mind, and strength and to love others as you love yourself. It would also include everything else in Exodus 19-Deuteronomy.
The Gentiles were never under the law.