俱舍論頌疏論本 17.13

17.13

續善疑有見者，疑謂疑有，見者謂正見。謂因果中生疑有心，此或應有，從疑有心或發正見，定謂有非無。爾時善根得還續起，故名續善。疑有續善，疑無斷善，為簡疑無，故言疑有。

Regarding "reconnecting the roots of good is through doubt or view of existence," "doubt" means doubting whether it exists, and "view" means right view. That is, generating in oneself a mind that doubts existence with respect to cause and effect: "Perhaps this exists." From the mind that doubts existence, one may generate right view, definitively asserting that it exists and is not non-existent. At that time, the roots of good are able to arise again in succession, and hence it is called reconnecting the roots of good. Doubting existence reconnects the roots of good, whereas doubting non-existence severs the roots of good; to distinguish it from doubting non-existence, it says "doubt of existence."