The fruit of dispassion is knowledge. The fruit of knowledge is withdrawal from sense objects. Peace due to the experience of bliss of the Self is itself the result of withdrawal.
Annotation
1) This verse is referring to dispassion and knowledge which were mentioned in verse 375 above. 2) Dispassion and withdrawal are the inherent means (antaraṅga sādhana–s) for knowledge. It means that though they are consciously practiced prior to realisation, they become the nature of a realised person and continue to stay (inhere) even in the state of realisation. Hence they are called inherent means. 3) Similarly, withdrawal (uparati) is consciously practiced to attain realisation and it becomes the nature of the realised person. 4) Knowledge of the Self is as a result of negation of the five sheaths. With such knowledge, dispassion and withdrawal manifest more strongly in the realised person (Jagadguru).