असत्यैव विकल्पोक्तिः सत्यभावो विकल्पते ।तमोपहतदृष्टित्वाद्द्विचन्द्रज्ञानदोषवत्
In plain words
The statement of a construct is itself unreal, yet the status of reality is imagined for it — because the sight is struck by darkness, as in the defect of perceiving a double moon.