We might think that Jesus spoke in parables to make it easier for people to understand his message. But blessed are your eyes, for they see, and your ears, for they hear. Truly I tell you, many prophets and righteous people longed to see what you see, but did not see it, and to hear what you hear, but did not hear it.
Most parables contain some element that is strange or unusual.
Parables do not define things precisely, but rather use comparisons to describe some aspect of how God acts or interacts with human beings.