Envy is a trick from the devil.

King James Version Chapter 4

And she again bare his brother Abel. And Abel was a keeper of sheep, but Cain was a tiller of the ground.

King James Version Chapter 6

Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord. Let not sin therefore reign in your mortal body, that ye should obey it in the lusts thereof. Neither yield ye your members as instruments of unrighteousness unto sin: but yield yourselves unto God, as those that are alive from the dead, and your members as instruments of righteousness unto God. For sin shall not have dominion over you: for ye are not under the law, but under grace.

King James Version Chapter 3

Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal life abiding in him.

King James Version Chapter 6

Above all, taking the shield of faith, wherewith ye shall be able to quench all the fiery darts of the wicked.

Envy.

If you have envy in your life know then that the devil is tricking you, tempting you to sin.

St. Paul teaches that we are to reckon ourselves to be dead indeed unto sin, but alive unto God the Heavenly Father through Christ Jesus our Lord. This verse does not only allude to our sexual sins, but indeed to all sin.... Paul says, let not sin therefore reign in your mortal bodies — that we should obey the lust thereof. Yes, there can be a lust of pride; a lust of vainglory; and a lust of greed, so do not be mistaken thinking that only sexual desires produce lust. The lust of sin has no direct opposite, and it is not through stern determination that we overcome sin, but we overcome sin with grace and with the blood sacrifice of Christ Jesus’ cross and the gift of the Holy Spirit: we reckon ourselves dead to sin because Christ Jesus put sin to death in his body and therefore, if we are truly baptized in the Holy Spirit our bodies are also dead to sin. Moreover, St. Paul tells us do not let sin reign in your bodies, but let our body be an instrument of God the Heavenly Father’s Holy Righteousness.

Now St. John teaches that if we hate our brother, we are murders.

St. Paul teaches us to use our shield of faith and to not fall to the fiery temptation of sin.

Now Cain hated Abel, and he murdered his brother, and this hatred stemmed from envy. God told Cain he could do better, but the devil filled his, Cain’s soul with hatred, and instead of doing better Cain chose murder.

Now, when I had these thoughts going through my head, sort of a funny thing occurred when all these idea culminated. Abel being a goat herder and Cain being a raiser of peas, the thought came to my mind -- that Cain must have envied his brother, Abel because his goats could fart, but Cain’s peas were swollen.