Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
षष्ठे शुभाः शत्रुदाः स्युः पापाः शत्रुक्षयंकराः ।व्याधिदाः सप्तमे पापाः सौम्याः शुभफलप्रदाः ॥ ५३४ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 534.
In the 6th house, good planets may bring enemies. Bad planets help one overcome enemies. In the 7th house, bad planets can bring illness. Good planets give good results.
Simple meaning: In the 6th, bad planets help one overcome enemies. In the 7th, bad planets can bring illness.
Classical view, not medical advice.
अष्टमस्थाः खगाः सर्वे कर्तुर्मृत्युप्रदायकाः ।
Planets in the 8th house may risk the doer's life. In the 9th, good planets bring blessings.
कर्मगा दुःखदाः पापा सौम्याश्चंद्रश्च कीर्तिदाः ।
In the 10th, good planets bring fame. In the 11th, all planets bring gain.
व्ययस्थानगताः शश्वद्बहुव्ययकरा ग्रहाः ।
Planets in the 12th bring heavy spending. An installation without money or mantras may risk the doer's or priest's life.