Why might a discharge be denied?

According to the Bankruptcy Code, the court may deny a discharge under Chapter 7 if:
“. . . it finds that the debtor: failed to keep or produce adequate books or financial records; failed to explain satisfactorily any loss of assets; committed a bankruptcy crime such as perjury; failed to obey a lawful order of the bankruptcy court; fraudulently transferred, concealed, or destroyed property that would have become property of the estate; or failed to complete an approved instructional course concerning financial management.” (11 U.S.C. § 727; Fed. R. Bankr. P. 4005)