The letter was likely written in AD 54 or 55.
The reassurance in the letter comes after Paul first warns the Galatians of things they should avoid.
“… Now by the works of the flesh are evident: sexual immorality, impurity, sensuality, idolatry, sorcery, enmity, strife, jealousy, fits of anger, rivalries, dissensions, divisions, envy, drunkenness, orgies, and things like these.
“I warn you, as I warned you before, that those who do such things will not inherit the kingdom of God. But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control; against such things there is no law.
“And those who belong to Christ Jesus have crucified the flesh with its passions and desires,” the passages leading up to 6:9 reads.