Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
निष्फलौ तौ ग्रहौ स्वेन शत्रुणा च विलोकितौ ।नीचराशिगतः स्वस्य शत्रोः क्षेत्रगतोऽपि वा ॥ २७९ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 279.
Those two planets give no result if their own enemy looks at them. So too a planet in its nicha (low point) sign, or in its enemy's sign,
Simple meaning: A planet seen by its enemy, or in its low or enemy sign, gives no result.
शुभाशुभफलं नैव दद्यादस्तमितोपि वा ।
A set planet gives no result. When planets sit badly, do a peace ritual.
हानिर्वृद्धिर्ग्रहाधीना तस्मात्पूज्यतमा ग्रहाः ।
Gain and loss depend on planets, so worship them. Wear the right gems.
पुष्परागं तथा वज्रं नीलं गोमेदसंज्ञितम् ।
Wear these gems in order to please the planets.