When you seethe with anger at your enemies, remember:
“But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you; that ye may be the children of your Father which is in heaven: for he maketh his sun to rise on the evil and on the good, and sendeth rain on the just and on the unjust.” Matthew 5:44-45 KJV
Also remember, justice will most certainly be served:
“Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord.” Romans 12:19 KJV
All honor and glory to our Lord Jesus Christ.
I typically interpret the "slave" to another as to mean that "your will is my will" - not a slave as someone forced to labor against their will, but rather, a slave in that your will is completely devoted to achieving another's will - e.g. we all want to achieve God's will, not our own separate will.