Phaladeepika
असत्फलः सौम्यनिरीक्षितो यः शुभप्रदश्चाप्यशुभेक्षितश्च । द्वौ निष्फलौ द्वावपि खेचरेन्द्रौ यः शत्रुणा स्वेन विलोकितश्च ॥ ३०॥
A planet yielding unfavourable result when aspected by a benefic, or the one that gives good resulls if aspected by a malefic, both become void of effect. The same will be the case if they are aspected by their respective inimical planets.
english translation
asatphalaH saumyanirIkSito yaH zubhapradazcApyazubhekSitazca । dvau niSphalau dvAvapi khecarendrau yaH zatruNA svena vilokitazca ॥ 30॥
hk transliteration by Sanscript