The text mentions Dev felt 'doubtful in his heart.' What was the context of this doubt, and how does it relate to his earlier interaction with the Sanyasi?

Dev's doubt arose when a Sanyasi, who had previously come seeking donations for cow protection, returned to Dahanu much earlier than expected. In their first meeting, as described in Chapter 40, Dev had explained that another collection was already in progress and that it was not a favorable time for a new fundraising effort. He explicitly told the Sanyasi to return after two to four months. However, the Sanyasi reappeared in about a month. Seeing him alight from a tonga, Dev felt suspicious, wondering why he had come back so soon and if he had forgotten their previous conversation. This premature return was the specific 'root of the suspicion' mentioned in the text.