All Saints’ Day is a solemn holy day, dedicated to the saints of the Church, that is, all those who have attained heaven. It is a day of obligation.
We all have this “universal call to holiness.” What must we to do in order to join the company of the saints in heaven? We “must follow in His footsteps and conform [our]selves to His image seeking the will of the Father in all things. [We] must devote [our]selves with all [our] being to the glory of God and the service of [our] neighbour. In this way, the holiness of the People of God will grow into an abundant harvest of good, as is admirably shown by the life of so many saints in Church history” (Lumen Gentium, 40).