Authors:

But Katie knew it was a sin, had known from the moment she made the decision to lie with Adam. However, the transgression wasn't making love without the sanction of marriage. It was that for the first time in her life, Katie had put herself first. Put her own wants and needs above everything and everyone else.

Jodi Picoult (2007). “Plain Truth”, p.205, Simon and Schuster
But Katie knew it was a sin, had known from the moment she made the decision to lie with Adam. However, the transgression wasn't making love without the sanction of marriage. It was that for the first time in her life,