Yuga-Vibhāga and Kāla-Pramāṇa
Measures of Time and the Four Yugas
युगपत्समयेनार्थो द्विधा वक्तुं न शक्यते / क्रमागतं मया ह्येतत्तुभ्यं नोक्त युग द्वयम्
yugapatsamayenārtho dvidhā vaktuṃ na śakyate / kramāgataṃ mayā hyetattubhyaṃ nokta yuga dvayam
The meaning cannot be spoken in two ways at the same time; therefore, what has come in due sequence I have not told you as two yugas at once.