the exercise of discretion

grave abuse of discretion “implies such capricious and whimsical exercise of judgment as is equivalent to lack of jurisdiction, or, in other words, where the power is exercised in an arbitrary or despotic manner by reason of passion or personal hostility, and it must be so patent and gross as to amount to an evasion of positive duty or to a virtual refusal to perform the duty enjoined or to act at all in contemplation of law.”