understand the un-understanding

sometimes, i owas think, wat is understand reli means? what does understand's limitation till? and how is the deepness of understand then can be categorize as understand? sometimes, understand can be a crazy things, sometimes, it can be a torture things, sometimes, i can be also an fearful things... is understand reli important? do we have to understand something, or everything? why muz we understand things that sometimes, we are nt understand? is tat reli that important?
to be cont...