For to this you were called, because Christ also suffered for us, leaving you{TR reads "us" instead of "you"} an example, that you should follow his steps,
Hereunto were ye called ... Christ suffered vicariously for all people; and it is incumbent upon his followers that they should not shrink from any duty because of any suffering that might be incurred.  There is also the thought here that, just as slaves were obligated to obey their masters, so Christians are also obligated to obey Christ.