All 3 Uses of

white lie
in
Atlas Shrugged

She thought that no man of the outer world would have said this to her at this moment-she thought of the world's code that worshipped white lies as an act of mercy-she felt a stab of revulsion against that code, suddenly seeing its full ugliness for the first timeshe felt an enormous pride for the tight, clean face of the man before her-he saw the shape of her mouth drawn firm in self-control, yet softened by some tremulous emotion, while she answered quietly, "Thank you.†
Chpt 3.2

white lies = unimportant lies (especially when told to be polite or helpful)

But there are no white lies, there is only the blackness of destruction, and a white lie is the blackest of all.†
Chpt 3.3

But there are no white lies, there is only the blackness of destruction, and a white lie is the blackest of all.†
Chpt 3.3 *

white lie = an unimportant lie (especially one told to be polite or helpful)