Proof of a motive is not required for the conviction of a crime. The existence of a motive is immaterial to the matter of guilt when that guilt is clearly established. However, when guilt is not clearly established, the presence of a motive might help to establish it. If a prosecution is based entirely on CIRCUMSTANTIAL EVIDENCE, the presence of a motive might be persuasive in establishing guilt; likewise, the absence of a motive might support a finding of innocence.