主義

1. Origins, structure, and basic meaning

• Structure: 主義(しゅぎ) is a principle or ideology underlying thought or behavior.
• Basic usage: It covers both a personal rule against bringing work into one's holidays and an ideology such as the pacifism reflected in a work.

2. Common pitfalls and similar expressions

• Expressing a personal rule
  • The first example's 持ち込まない主義だ presents not bringing in work as one's personal policy. Following an expression of behavior in this way, it conveys a rule of life rather than the name of a broad ideology.