In light of the first steps in the possible start of Chesterton's cause, here's a prayer from the American Chesterton Society:
Prayer for the intercession of G. K. Chesterton
God our Father,
You filled the life of your servant Gilbert Keith Chesterton with a sense of wonder and joy, and gave him a faith which was the foundation of his ceaseless work, a hope which sprang from his enduring gratitude for the gift of human life, and a charity towards all men, particularly his opponents.
May his innocence and his laughter, his constancy in fighting for the Christian faith in a world losing belief, his lifelong devotion to the Blessed Virgin Mary and his love for all men, especially for the poor, bring cheerfulness to those in despair, conviction and warmth to lukewarm believers and the knowledge of God to those without faith.
We beg you to grant the favors we ask through his intercession, [and especially for ……] so that his holiness may be recognized by all and the Church may proclaim him Blessed.
We ask this through Christ our Lord.