A great curiosity came on the trustee, to disregard the prohibition and dive at once to the bottom of these mysteries; but professional honour and faith to his dead friend were stringent obligations; and the packet slept in the inmost corner of his private safe.
These passed away, and left me faint; and then as in its turn the faintness subsided, I began to be aware of a change in the temper of my thoughts, a greater boldness, a contempt of danger, a solution of the bonds of obligation.
I felt younger, lighter, happier in body; within I was conscious of a heady recklessness, a current of disordered sensual images running like a mill-race in my fancy, a solution of the bonds of obligation, an unknown but not an innocent freedom of the soul.
…decease of Henry Jekyll, M.D., D.C.L., L.L.D., F.R.S., etc., all his possessions were to pass into the hands of his "friend and benefactor Edward Hyde," but that in case of 12) Dr. Jekyll’s "disappearance or unexplained absence for any period exceeding three calendar months," the said Edward Hyde should step into the said Henry Jekyll’s shoes without further delay and free from any burthen or obligation, beyond the payment of a few small sums to the members of the doctor’s household.
There are no more uses of "obligation" in the book.