摩訶止觀 4.153

4.153

疑蓋者，此非見諦障理之疑，乃是障定疑也。疑有三種：一、疑自，二、疑師，三、疑法。一、疑自者，謂我身底下，必非道器，是故疑身。二、疑師者，此人身口不稱我懷，何必能有深禪好慧？師而事之，將不誤我？三、疑法者，所受之法，何必中理？三疑猶豫，常在懷抱，禪定不發；設發永失。此是疑蓋之相也。

As for the hindrance of doubt: this is not the doubt that obstructs the principle upon seeing the truth, but the doubt that obstructs concentration. There are three kinds of doubt: first, doubting oneself; second, doubting the master; third, doubting the teaching. First, doubting oneself: thinking that one's own body is lowly and certainly not a vessel for the path, one therefore doubts oneself. Second, doubting the master: [thinking] this person's bodily and verbal deeds do not accord with my mind; how could he certainly possess deep dhyāna and fine wisdom? If I take him as master and serve him, will he not mislead me? Third, doubting the teaching: does the teaching received necessarily accord with the principle? When these three doubts of hesitation are constantly harbored in the breast, meditative concentration will not arise; even if it arises, it is permanently lost. This is the characteristic of the hindrance of doubt.