CC Antya 7.21

ṣaḍ-darśana-vettā bhaṭṭācārya-sārvabhauma
ṣaḍ-darśane jagad-guru bhāgavatottama
Synonyms: 
ṣaṭ-darśana — of the six philosophical theses; vettā — the knower; bhaṭṭācārya-sārvabhauma — Sārvabhauma Bhaṭṭācārya; ṣaṭ-darśane — in six philosophical theses; jagat-guru — the spiritual master of the entire world; bhāgavata-uttama — the best of the devotees.
Translation: 
“Sārvabhauma Bhaṭṭācārya perfectly knows the six philosophical theses. He is therefore the spiritual master of the entire world in teaching the six paths of philosophy. He is the best of devotees.