Phaladeepika
श्रेष्ठेति सा सप्तमदृष्टिरेव सर्वत्र वाच्या न तथाऽन्यदृष्टिः । योगादिषु न्यूनफलप्रदेति विशेषदृष्टिर्न तु कैश्चिदुक्ता ॥ ९॥
The aspect from the 7 th house is the only one that should be declared as most effective in all cases ; not so, the rest. But there are others who opine that the special aspect (of Saturn, Jupiter and Mars) is in no way less efficacious in producing full effect in all Yogas and the like.
english translation
zreSTheti sA saptamadRSTireva sarvatra vAcyA na tathA'nyadRSTiH । yogAdiSu nyUnaphalapradeti vizeSadRSTirna tu kaizciduktA ॥ 9॥
hk transliteration by Sanscript