Because the passions of the flesh are waging war against our souls (1 Peter 2:11). As Jesus warned, our flesh is weak. It wants us to give in to our passions. Giving in, lying down, closing our eyes for just a minute, is so much easier than going to war against them. Especially if our passions have become our bosom companions. 

Wage war? How?

Wake up and pay attention. In his second letter, Peter twice states his intention of waking us up completely, stirring us up.