Bless my enemies, O Lord. Even I bless them and do not curse them. 

Enemies have driven me into Your embrace more than friends have.

Friends have bound me to earth, enemies have loosed me from earth

and have demolished all my aspirations in the world.

Enemies have made me a stranger in worldly realms
and an extraneous inhabitant of the world.
Just as a hunted animal finds safer shelter than an unhunted animal does,
so have I, persecuted by enemies, found the safest sanctuary,
having hidden myself beneath Your tabernacle,
where neither friends nor enemies can slay my soul.

Bless my enemies, O Lord. Even I bless them and do not curse them. 
They, rather than I, have confessed my sins before the world…
They have scolded me, whenever I have flattered myself…

Bless my enemies, O Lord. Even I bless them and do not curse them…

Whenever I have wanted to lead people, they have shoved me into the background.
Whenever I have rushed to enrich myself, they have prevented me with an iron hand…
Whenever I have tried to build a home for a long and tranquil life,
they have demolished it and driven me out.
Truly, enemies have cut me loose from the world
and have stretched out my hands to the hem of Your garment.

Bless my enemies, O Lord. Even I bless them and do not curse them…

So that my fleeing to You may have no return;
So that all my hope in people may be scattered like cobwebs;
So that absolute serenity may begin to reign in my soul;
So that my heart may become the grave of my two evil twins: arrogance and anger;
So that I might amass all my treasure in heaven;
Ah, so that I may for once be freed from self-deception,

which has entangled me
in the dreadful web of illusory life.

Enemies have taught me to know what hardly anyone knows,

that we have no enemies in the world except ourselves… 

It is truly difficult for me to say who has done me more good

and who has done me more evil in the world: friends or enemies.

Therefore bless, O Lord, both my friends and my enemies.

Slaves curse their enemies, for they do not understand.

But sons and daughters bless them, for they understand.

For they know that their enemies cannot touch their life.

Therefore they freely step among their enemies, and pray to God for them.

source: https://wiserwalk.com/prayers/bless-my-enemies-o-lord/

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Who wrote it?

Nikolaj Velimirović (January 1881– March 1956) was a Serbian Orthodox prelate who served as Bishop of Ohrid and Žiča from 1920 to 1956. An influential theological writer and a gifted orator, he was often referred to as the "new John Chrysostom". According to a number of historians he is one of the most influential bishops of the Serbian Orthodox Church in the twentieth century.

As a young man, he came close to dying of dysentery and decided that he would dedicate his life to God if he survived. He lived and was tonsured as a monk under the name Nikolaj in 1909. He was ordained into the clergy, and quickly became an important leader and spokesman for the Serbian Orthodox Church, especially in its relations with the West. When Nazi Germany occupied Yugoslavia in World War II, Velimirović was imprisoned and eventually taken to Dachau concentration camp. After being released by Germans in December 1944, Velimirović spent time in Slovenia, where he blessed anti-communist volunteers such as Dimitrije Ljotić and other Nazi collaborators. After the war, he moved to the United States in 1946, where he remained until his death in 1956. [Wikipedia]