Karika 04

दृष्टमनुमानमाप्तवचनं च सर्वप्रमाणसिद्धत्वात्। त्रिविधं प्रमाणमिष्टं प्रमेयसिद्धिः प्रमाणाद्धि ॥४॥

Three types of well-established evidential proof are direct perception, inference, and trustworthy statements from dear ones. The evidence is desired, as establishing hypothesis is possible only through evidential proof.