Be convinced in your reason that the Catholic Church is a teacher sent to you from God, and it is enough. I do not wish you to join her, till you are. If you are half convinced, pray for a full conviction, and wait till you have it. It is better indeed to come quickly, but better slowly than carelessly; and sometimes, as the proverb goes, the more haste, the worse speed. Only make yourselves sure that the delay is not from any fault of yours, which you can remedy. God deals with us very differently; conviction comes slowly to some men, quickly to others; in some it is the result of much thought and many reasonings, in others of a sudden illumination.
And a prayer from the posthumous Meditations and Devotions:
O Lord, who art called the Branch, the Orient, the Splendour of the eternal light, and the Sun of Justice, who art that Tree, of whom Thy beloved disciple speaks as the Tree of life, bearing twelve fruits, and its leaves for the healing of the nations, give Thy grace and blessing on all those various states and conditions in Thy Holy Church, which have sprung from Thee and live in Thy Life. Give to all Bishops the gifts of knowledge, discernment, prudence, and love. Give to all priests to be humble, tender, and pure; give to all pastors of Thy flock to be zealous, vigilant, and unworldly; give to all religious bodies to act up to their rule, to be simple and without guile, and to set their hearts upon invisible things and them only. Grant to fathers of families to recollect that they will have hereafter to give account of the souls of their children; grant to all husbands to be tender and true; to all wives to be obedient and patient; grant to all children to be docile; to all young people to be chaste; to all the aged to be fervent in spirit; to all who are engaged in business, to be honest and unselfish; and to all of us the necessary graces of faith, hope, charity, and contrition.