It is called "Sarartha" because Vishvanatha Chakravarti Thakura extracted the spiritual essence from the earlier works of Sridhara Swami, Sri Rupa Gosvami, and Sanatana Gosvami .
# Save the PDF with filename .pdf pdf.output("sarartha_darshini.pdf") sarartha darshini pdf
https://archive.org/download/sarartha-darshini/sarartha-darshini.pdf Sri Rupa Gosvami