The mother of one of the 26 victims of 2012's Sandy Hook Elementary School massacre has written a powerful letter to the teachers of America.

Nebla Marquez-Greene had two children attending Sandy Hook Elementary that day. Her daughter, 6-year-old Ana Grace, was killed in the Connecticut massacre, and her son was uninjured in the attack.

Her letter, which was posted on the Education Week website is powerful, gut-wrenching and encouraging all at once. Read it after the jump.

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As another school year begins and old routines settle back into place, I wanted to share my story in honor of the teachers everywhere who care for our children.

I lost my 6-year-old daughter Ana Grace on Dec. 14, 2012, in the rampage at Sandy Hook Elementary School. My son, who was in the building and heard the shooting, survived.