Wiktionary
make conscience
alt. (context obsolete English) To make it a matter of conscience; to be scrupulous about. (16th-19th c.) vb. (context obsolete English) To make it a matter of conscience; to be scrupulous about. (16th-19th c.)
Usage examples of "make conscience".
To offer thought to the thirst of men, to give them all as an elixir the notion of God, to make conscience and science fraternize in them, to render them just by this mysterious confrontation.
And those very few that are left, that make conscience of the laws of the nation, and of keeping days of abstinence, will be forced to eat flesh, or suffer more inconveniences than are yet foreseen.