I was thinking about the phrase "It is necessary to doubt either before or after, but not during." Only now I understand it. I think it's about the second principle of yoga, about effective work. Doubts can ruin any, even the most noble cause. In general, your thought during your work are very important. After all, thoughts are reborn into intention, into energy, which you will invest in the results of your work. And even though karma yoga teaches us not to get attached to the results, they are still important for a modern person. And while we are not so spiritual that we can abstract, we still continue to focus on them. Therefore, it is important to make sure that the path to your goal is confident. And after reaching it, you can sit down and reflect and, perhaps, chart a new path.