To avoid Hell, it is necessary to obey the Church, the priests, one’s superiors, and one’s parents, even in little things.
To avoid Hell, it is necessary to be humble: dependant on God, making plans with reliance on His Will (“I will go here, if God wills it”, “I will do this, if God wills it”), praying without unceasing and giving thanks in all circumstances, mortifying oneself, accusing oneself of one’s sins, giving God the credit for all good things, thinking of others before oneself, being truthful and truly repentant in Confession, and changing one’s life after Confession.
To avoid Hell, it is necessary to go to Confession and go to Mass, and receive Holy Communion as often as one goes to Mass.
Disobedience, pride, and neglientance are what cause many to go to Hell, and they lead to terrible sins, especially sins against the flesh. Obedience, humility, and charity are what save souls from Hell, and they lead to wonderful graces, especially purity of heart. The man who is dependant on God’s grace to do all things and trusts completely in His Mercy will never be sad, for God dose not disappoint: He will give much to the lowly man. Yet the man who is dependant on himself to do all things and trusts in himself will never be happy, for God dose not satisfy him: He will take much away from the proud man.