Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 7 · Samskara Muhurtas
संस्कारमुहूर्ताः
गुरुशिखिनोश्च शाखेशे कलाशीलविवर्जितः ।स्वाधिशत्रुगृहस्थे वा तदंशस्थेऽथ वा व्रती ॥ ३६२ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 362.
Say this is Jupiter and Ketu, or the shakhesha (lord of the person's Veda branch). Then the boy lacks skill in the arts and good conduct. Or say they are in the sign of their bitter enemy, or in that navamsha (one-ninth part of a sign). Then the initiated boy... (Our text is unclear here: Ketu may be a misprint for Venus.)
Simple meaning: Jupiter or the branch lord in a weak or enemy sign leaves the boy without skills and good conduct.
शाखेशे वा गुरौ शुक्रे महापातककृद्भवेत् ।
Branch lord, Jupiter or Venus in a bitter enemy's sign can lead the boy to great sins.
शाखेशे वा गुरौ शुक्रे केंद्रगे वा त्रिकोणगे ।
Branch lord, Jupiter or Venus in a good house brings wealth and Vedic learning.
परमोच्चगते जीवे शाखेशे वाथ वा सिते ।
With Jupiter or Venus very strong and a clean 8th house, the boy masters the scriptures.