As Abbot Gueranger writes in The Liturgical Year, Vol VI:
Let us hope that, by God's mercy, the holy time we are now entering upon will work such a happy change in us, that, on the day of judgment, we may confidently fix our eyes on Him we are now about to contemplate crucified in the hands of sinners. The death of Jesus puts the whole of nature in commotion; the midday sun is darkened, the earth is shaken to its very foundations, the rocks are split; may it be that our hearts, too, be moved and pass from indifference to fear, from fear to hope, and, at length from hope to love; so that having gone down with our Crucified to the very depths of sorrow, we may deserve to rise with Him unto light and joy, beaming with the brightness of His Resurrection, and having within ourselves the pledge of new life, which shall then die no more.During Passiontide, it is good to reflect upon the nature of envy and jealousy, for it is envy and jealousy which killed Jesus.
Envy disrupts social life generally. It sets the child against the father, brother against brother, neighbor against neighbor, and nation against nation. It kills friendship, undermines business relationships, and hinders reconciliation. It is one of the chief sources of misunderstanding, criticism, hatred, vengeance, calumny, detraction, and perverse attacks upon private life.(Excerpt from The Hidden Power of Kindness by Father Lawrence Lovasik, Sophia Institute Press, 1999, pp.62-63)
Envy and greed, the source of the world's unrest and wars, are sins against charity, because they make us seek what belongs to others. Often, even at the cost of harm to our neighbor, we want what does not belong to us....The envious person becomes distrustful, unjust, suspicious. Envy makes its victims ill-tempered, sad, and unapproachable....
Jealousy implies the fear of being displaced by a rival, or of being deprived of that which is rightfully ours or of that which we think ought to be ours. Jealousy is anther form of envy. Jealousy has to do with our own possessions, whereas envy has to do with the possessions of others. We resent an intrusion upon that which belongs to us, and we are prone to become vengeful at this disregard of our rights and claims.
Jealousy goes a step further than envy; it not only tries to lessen the good opinion others enjoy and criticizes those who are praised and rewarded, but is characterized by an excessive love of our own personal good and brings on a fear that we will be deprived of it. Jealousy prefers to see good left undone rather than lose a single degree of praise.