Donald MacKay was first and foremost a scientist, but since he was a man of wide-ranging interests, this representative selection covers a rich variety of topics which will be of interest well beyond the scientific and philosophical fold. They represent a sustained effort to think clearly and compassionately on issues as diverse as human engineering. artificial intelligence, value-free knowledge, determinism and creation. Several of the pieces were originally addressed to Christian audiences, but there is much here which will be of

immense value to any honest seeker after truth.