While in some circumstances it can be healthy to doubt, the kind of doubt meant here is that which is debilitating and holds us back from practice and understanding. When doubt as an obstacle arises in your experience, simply let it pass without trying to hold on to it or push it away. You can “abandon” doubt by not letting it get a foothold in your mind but instead watching it arise and pass away, as it will naturally do if you let it. | 
