The seven sacraments as a whole
The seven sacraments belong to one sacramental life. Baptism, Confirmation or Chrismation, and the Eucharist initiate Christian life; penance and anointing serve healing; Holy Orders and Matrimony serve communion and mission. These groupings show their relationships rather than making any sacrament an isolated religious milestone. Their celebration differs in legitimate ways across Catholic traditions.
Follow the sources
An original library introduction, with sources for further study. This is a starting point rather than a complete treatment or a finished formation lesson.