Pacifism is not passivity

Pacifism isn’t quietism or withdrawal or inactivity, and it isn’t simple submission. Pacifism’s root is connected to the peacemaking beatitude, rooted in love and expressed when the follower of Jesus actively seeks peace. Pacifism isn’t a lack of interest or noninvolvement, but the hard work of seeking peace. Pacifism is nonviolent resistance, not nonresistance. What Jesus teaches his followers to do illustrates the sort of pacifism he advocates: turn the other cheek, surrender even more clothing, go the extra mile, lend and do not charge interest or require a payment back. Hardly the stuff of the inactive. These acts subvert the Roman system.— Sermon on the Mount, pages 131-132

<idle musing>
Hmmm...I agree wholeheartedly with this but wonder, did Jesus teach pacifism or nonresistance? I ask this on the basis of this book that I read in 2012 and excerpted from at that time.
</idle musing>