Abel's Willingness

Abel knew his sacrifice had been accepted.
Abel knew Cain was angry that his sacrifice was not accepted.
Abel knew Cain was angry at him.
Abel knew God, he was accepted by God and then
his sacrifice was accepted.
Abel knew that a sacrifice was necessary to cover sin.
Abel was willing to go for the walk with Cain.
Abel was willing to be God's instrument to reach out
to Cain one last time.
Abel was willing to be a sacrifice of love for his brother Cain.