We can cleanse our souls and our consciences by repenting of our sins and going to confession, making reparation and receiving Jesus in the Holy Eucharist.
CCC 1035 The teaching of the Church affirms the existence of hell and its eternity. Immediately after death the souls of those who die in a state of mortal sin descend into hell, where they suffer the punishments of hell, "eternal fire."617 The chief punishment of hell is eternal separation from God, in whom alone man can possess the life and happiness for which he was created and for which he longs.
CCC 1037 God predestines no one to go to hell;620 for this, a willful turning away from God (a mortal sin) is necessary, and persistence in it until the end. In the Eucharistic liturgy and in the daily prayers of her faithful, the Church implores the mercy of God, who does not want "any to perish, but all to come to repentance":621
Father, accept this offering
from your whole family.
Grant us your peace in this life,
save us from final damnation,
and count us among those you have chosen
Fatima Prayer: O My Jesus
O MY JESUS, forgive us our sins, save us from the fires of Hell and lead all souls to Heaven, especially those who are in most need of Thy mercy.
CCC 1730 God created man a rational being, conferring on him the dignity of a person who can initiate and control his own actions. "God willed that man should be 'left in the hand of his own counsel,' so that he might of his own accord seek his Creator and freely attain his full and blessed perfection by cleaving to him."
Man is rational and therefore like God; he is created with free will and is master over his acts.