What this rule checks
Your Saturn is in the 1st house, in a sign that is not its own and not its strongest. Saturn is about discipline and time. The 1st house is about you, your body and how others see you. Source: Phaladeepika, chapter 8 (a classic text), slokas 20 to 24. Notes beyond the classic text are the author's own modern reading. Classic texts describe this placement harshly. Read it as a tendency, not a verdict.