Adam and Eve’s first two children were born with different talents and personalities. Cain was a farmer and envious; Abel was a shepherd and very giving.

It’s likely that Abel’s good nature brought out Cain’s evil nature.

There was no reason for the farmer to be jealous of the shepherd. After all, all of the land was available to both. They chose freely where to develop their individual skills.

But Cain’s personality just didn’t mesh well with Abel’s personality.
That always happens.
The “brethren’s” evil character traits give rise to evil deeds … which includes their offerings.

God rejected Cain’s sacrifice, just like He rejects every sacrifice from those who have an evil nature, even if they try their hardest to impersonate one of our brothers.

The Altar determines the offering giver’s spirit.
Hypocrites may deceive the sincere and pure of heart, but not the Spirit of the Altar!

Brethren Cain’s evil nature was able to put up with his brother until the day they presented their sacrifice. D-Day.

Maybe, he wanted to prove to Abel just how spiritual he was, with his “sacrificial offering”.
He wanted to turn it into a competition.
Those with an evil nature always want to compete with those who are good, to determine who is better.

However, when it comes to the Altar, the Righteous Judge will not let things go unchallenged.

Cain struck out, because besides being rejected, the Lord was pleased with his brother’s sacrifice.
That was the last straw.
Moved by the spirit of jealousy, Cain did not resist. The first opportunity he had, he killed his brother.

But Abel’s death could not silence his cries. Instead, his blood cried out louder and stronger from the earth, like the Lord said:

“What have you done? Listen! Your brother’s blood cries out to Me from the ground” Genesis 4:10

Cain lost. He was cursed for the rest of his life.
Abel won. He remained righteous before God; therefore, he was saved and still speaks.

“By faith Abel brought God a better offering than Cain did. By faith he was commended as righteous, when God spoke well of his offerings. And by faith Abel still speaks, even though he is dead.” Hebrews 11:4

Pay close attention:
Be careful when dealing with “brethren”. They are more dangerous than the unbelievers. Like whitewashed tombs, they wait patiently to devour the honest and pure of faith.
All caution is not enough.