The tree asked Madhu to think over his wish because Madhu only asked for food and nothing else. The tree wanted him to consider if food alone would truly satisfy all his needs, as he might later realize he needed other important things like water.

The chapter shows that the tree warned Madhu by asking 'You don't want anything else? Think it over.' This was wise advice because Madhu later desperately needed water when he got hiccups but couldn't get it since he had only wished for food. The tree knew that food alone wasn't enough for a complete life.