‘No Executor or Trustee expressly acting as such shall be liable for any loss arising by reason of any improper investment made in good faith or retention of any investment retained in good faith or for the negligence or fraud of any agent employed in good faith by him or her or by any other Executor or Trustee (whether or not the employment was strictly necessary or expedient) or by reason of any mistake or omission made in good faith or by reason of anything except deliberate or reckless wrongdoing on the part of the Executor or Trustee whom it is sought to make liable.’