Ornament of the Sutra Collection ཐེག་པ་ཆེན་པོ་མདོ་སྡེའི་རྒྱན།

Voidness, giving up the clinging of the idea of a self, study and meditation is successful.
Suffering is the disturbed state of the mind, suffering is not inherently existent, it's like a dream, in the same way thoughts and concepts are not truly existent, we have to pacify the suffering.