Cain and Abel: A GIFT TO GOD with different heart attitudes

Both knew that God is Creator and Giver of all good things.
But Cain offered something from the land, because he was supposed to bow before God, in reverence.
Abel came to God with his heart full of gratitude and offered the fattest parts of his flock.
One offered out of obligation; the other, Abel, out of genuine love.
God noticed that and was pleased with Abel. Noticing jealousy in Cain, God warned him:
SIN LIES AT YOUR DOOR ( of your mind and heart ). If you do not control it, it will control you.
God let Cain know that he had the possibility to choose to do the right thing and not the wrong one.
When murdering his brother Abel, Cain was exercising his free will, the wrong way.
There are CHOICES to make, we are to decide for the right one.

Here are some outcomes from students from Escola Secundária Rainha Dona Leonor in Lisbon.