The word indignant is a strong term. We use it when we are not only upset about something, but when whatever we are disturbed about has exceeded the reasonable boundaries of bad. In other words, it is so glaringly wrong that we are personally offended by it. It is the difference between someone making a common mistake (i.e., exceeding the speed limit by a few miles on the interstate) and something egregious (going 50 mph through a clearly marked school zone or the neighborhood you live in).
This is the word used for Jesus’ response to the disciples rebuking the people who were bringing their children to Jesus (Mark 10:13-16). It is the only occasion in the gospels where this word is used in reference to Christ. There’s something bordering irony here—Jesus is put out with the disciples for being put out with those bringing their children. Add to that, Jesus’ indignation is over the disciples’ failure to be like the children they are rebuking and the irony is compounded.
All of this should cause up to look closely at little children and to think about the way that they receive things. They are the way we are to receive the kingdom!