Ordination to the priesthood is always a call and a gift from God.
A bishop is given the grace to teach in the Name of Christ, to sanctify the Church through the celebration of the Sacraments; to guide, govern, and defend the Church; and to be a sign of the unity of the Church.
A priest is given the grace to proclaim the Gospel and preach, to celebrate the Sacraments (except Holy Orders) and to shepherd the people entrusted to him.
A permanent deacon is ordained to proclaim the Gospel and preach, to baptize, to assist the bishop or priest in the celebration of the Eucharist, to assist at and bless marriages, to preside at funerals, and to serve the community through works of charity.
The Sacrament of Ordination by Nicolas Poussin