Matthew 5:44 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; 45 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. 

Loves work for believers includes loving our enemies as the Savior stated on the Sermon of the Mount.

This may seem foolish in todays world of perpetual violence and death but regardless, as Christians we are told this is one of the ways the world will know who we are.

Love requires more than feelings, love is manifested in how we treat others.

So do good and remember the above quoted verses. Praise our Savior, Jesus the Christ.