If no doubt is entertained about acts, then acis done are sure to lead to success. The doubt we speak of is whether acts are obligatory or optional.
तत्र चेन्न भवेदेवं संशयः कर्मसिद्धये। कि तु कर्म स्वभावोऽयं ज्ञानं कर्मेति वा पुनः॥