tilopa's pupil maitripa became the principal master of mahāmudrā in india during his time and most lineages of mahāmudrā are traced from maitripa. maitripa was a very influential figure of the eleventh century, a scholar and tantrika who widely taught the ratnagotravibhaga, a text which is widely seen as bridging the sutric mahayana and anuttarayogatantra views. he composed commentaries on the buddhist dohas, and his works include a collection of 26 texts on "non-conceptual realization" ("amanasikara"), which are a key indian source of mahāmudrā teachings that blend sutra and tantra and teach an instantaneous approach to awakening.