For by grace you have been saved through faith, and that not of yourselves; it is the gift of God.
Ephesians 2:8
When a person works an eight-hour day and receives a fair day's pay for his time, that is a wage. When a person receives recognition for his achievements, that is an award. But when a person is not capable of earning a wage and deserves no award - yet receives such a gift anyway - that is a picture of God's unmerited favor. That is called the grace of God.
God's grace can be defined as a free gift. The story of God's grace begins at the cross. It was there that Jesus willingly died for you. Because of His death, you are able to receive the free gift of salvation.
His grace does not end at salvation. He continues to shower you with His favor and loving kindness without consideration of merit. Despite your sin, He bestows blessings on you: an unexpected raise, an anonymous gift, children that love God, opportunities to pursue your dreams, etc.
God, in His grace, has willingly and generously given to you. Will you willingly give yourself to Him? Will you give Him your talents, money, time, and service?
Grace is everything for nothing to those who don't deserve anything.
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