Please don't ever be upset by someone's sincere Christian Greeting.
To answer you question:
We believe the best example of one of God's concession is where Jesus explains about marriage and divorce in Matthew 19:3-9, where divorce was only granted because of the hardness of the human heart, but that it was never in the will of God.
Another good example is in 1 Samuel 8, when the people wanted a human king instead of God to rule over them. God granted their wish, but warned them of the consequences of opposing His will.
We look forward to hearing back from you.
In the Love of the Lord,
Frank and Mary