it says this in Matthew. 

In the Philip Gospel it states:
A Hebrew makes a Hebrew, and such a person is called a convert? A convert does not make a convert. [Some people] are as they [are] and make others [like them], while others simply are. 

The stretch of mankind's "wisdom" we have come across recently states (something like):

sometimes it takes sitting down with your enemy ... or ... sometimes it takes doing business with your enemy to make something happen ... in the most recent, it's referring to mankind's idea of what is peace .......... except, his idea of peace still includes military means involving murdering his [enemy] ... so, his UNDERSTANDING ON PEACE is no where near the Peace spoken of in the Writings. It's just that he believes himself having the rite of passage in this warring ... NO MATTER THE COSTS. this mindset comes from the ideology of something like the roman empire. remember this? and recall how it took and refashioned itself a garment and called it christianity? 

the Peace spoken of in the Writings has to do exclusively with UNDERSTANDING, which is striving within LOVE, not strident in deception, dishonesty, murderous pilgrimage, brutal destruction and carelessness, or even going along with something---paying into something---to be accepted, promoted, paid ... 

we want to make this clear before continuing in "love of enemy". you see, if one is talking about baking with apples and another with oranges ... the outcome will be significantly different

IN Philip's verse, the convert is the partner to "something" ... in the case of the Hebrew, it is his traditions, beliefs, culture and practices ... these are neither good nor bad (regarding this verse), because they do not house portent in and of themselves. and when we speak of PORTENT in Spiritual Language, we are referring to remediation (healing). 

A HEBREW MAKES A HEBREW is saying one born of Hebraic speech (verse, culture ...) HE MAKETH HIMSELF, not a convert in the sense of conversion such as turning around to look at and see self within ... and within the culture and what he maketh (acts, deeds, construct ...). he makes or fashions himself according to his culture ... traditions ... and where these are of instability, unjust, strident and murderous is where they are damaging to the greater chorus of verse (Voice), which includes neighbor. if neighbor says, wow, this neighborhood smells of pesticide ... we must leave ... we must go to a cleaner, more safe, field to grow our crops ... or ... the laws in this town are seriously unfair, we must leave because we cannot properly care for our family ... then he looks for a place to settle and he leaves. where he settles has laws, and he must decide if he can abide by these laws, or ... he says, wow, everywhere we look there are laws that are unjust to my wife [ my livestock and ...] ... and the wives of many others ... I must do something to help change these laws. he chooses to move into that portent, which is a process of igniting for help, health ... healing of some form, not so much for himself but for his family and his neighbor, but in this process, he is being redeemed. 
now, do understand that not all change/reform is of healing. some never move out of that smelly, unjust place, instead shifting positions ... what we call jumping ship (the man in a religious sect turns militant atheist then turns on all believers in God ... what has he accomplished? condemning what he does not understand? to call out hypocrisy of sect's practices, actions and system of belief within the organization and society is one thing, esp with facts and evidence to support these ... but condemning a "God" or believer in God ---a God not known to atheist--- is something else entirely and is not LOVING enemy) 

continuing ...