Yet another experience the king's son made on the first day of his guard.
The finger is for a child a very natural and familiar common tool of action. At any play the children mostly use their fingers.

“It is possible to gild, or to cultivate, the tools of action.
And this is possibly the very first step during the process of gilding, namely to first of all gild the tool or the organ by which on acts.

“The boy made use of this knowledge quite intuitively, he had it within him already as it were - that is why he first of all put his finger that hurt him into the well.