Truth Quotes in Cloud Atlas

How we cite our quotes: (Part.Chapter.Paragraph)

Quote #4

"I became a scientist because... it's like panning for gold in a muddy torrent. Truth is the gold." (3.31.39)

When Isaac Sachs says that searching for scientific truth is like searching for gold, we're reminded of the California Gold Rush, which was the backdrop for the Adam Ewing sections of the novel.
Sachs is a contrast though: he shows us that some people are motivated by something other than money.

Quote #5

Did I ever lie to get my story? Ten-mile-high whoppers every day before breakfast if it got me one inch closer to the truth. (3.35.22)

Here's an interesting dilemma. Luisa's dad often lied to get closer to the truth. Which lies are worth it when it comes to the truth?

Quote #6

Truth is singular. Its "versions" are mistruths. (5.1.2)

This is Sonmi-451's first line. It implies that she knows what the "truth" is, or at least that she's aware that there is a difference between truth and lies (which include versions of the truth that are almost—but not quite—true). By the end of her story, do you believe she's telling the truth, or just one of its "versions"?