Standing with one foot in two different boats, a person is guaranteed to fall into the river. Krishna describes three types of people who come to ruin: the ignorant (who never seek knowledge), the faithless (who refuse to trust anything), and the perpetual doubter (who questions everything but commits to nothing). Of these, the doubter suffers most.
Doubt is natural and healthy when it drives inquiry. But when doubt becomes a permanent residence — when a person never lands anywhere, never trusts any path, never takes a step — then neither this world nor any other offers peace. The doubter's tragedy is not that they asked questions. It is that they never accepted any answer long enough to walk forward.