The souls in Purgatory are faithful people, some of whom are still marred by attitudes unworthy of Heaven - hence the need for the purification wrought in each person by the Holy Spirit. No-one can enter Heaven unless full of gratitude, joy and humility. No-one can go in, still thinking, about his health in earthly life, or other matters: "Why should I be treated like this? I deserve better".
Whoever is willing to abandon prayer to attend to a needy neighbour is, as she reaches out to help, reaching out to Christ, who looks on with love and gratitude. The greatest love for God is shown in doing His Will, whether in prayer or service.
Christ told me: "By reverence, you enter into the Mystery. By the opposite, you cast yourself out". He was speaking about the Mystery of friendship with and intimacy with God. Great faith in Him should show itself in gestures of reverence and gratitude.
Christ told me how much joy it gave Him to see me full of wonder at the gift of life, each time I was pregnant. Each time I celebrate the birthday of one of the children, I find that Christ shows me anew, in prayer, how He delights in my gratitude.
As well as being fervent teachers, the Church's greatest sinners, when forgiven, have been the most lyrical in their expressions of gratitude to God for helping the weak and hopeless: for example, St. Augustine of Hippo, St. Ignatius Loyola, and St. Francis of Assisi.
Christ was paraded by His captors before jeering crowds; yet He accepted without hatred or impatience the humiliating treatment he received because of His words. He let nothing stop Him from His mission to show out His Divine nature and to rescue us from our sins. We cannot repay Him for all He suffered to bring truth and salvation to the world; but we give joy to Him when, in gratitude, we show love towards Him and our neighbour.
How sad it is, in an earthly home, when a child disobeys, grumbles, shouts, stamps, sulks, and lacks gratitude. That it what it is like in the 'family' of the Church when members grumble about attending Mass, disobey God's laws, contradict Church teachings and gossip about the Clergy.
When we turn to Christ in prayer, in gratitude for His gifts and graces, all the Saints are close to us, glad to hear our thanks and praise for the One Who has brought them to Heaven. They long for us to find everlasting joy with Him, and help us by their prayers.