The sons of a well-known Sikh priest, who was shot in the head during an August attack on a temple in Wisconsin, have been sitting vigil by his side 24 hours a day, reported the Associated Press.

During their shifts, the men recited the word "waheguru," a Punjabi words that refers to the "wondrous expression of God's presence," according to the news agency.

Eventually the priest, Punjab Singh, began to move his lips, in an apparent attempt to repeat the word, according to both the sons and a speech therapist.

Six were killed in the attack, and of the three additional people who were injured, Singh had the worst injuries. The shooter killed himself.

Doctors call his progress "remarkable," according to the AP, although the chances that he will ever walk are slim and his ability to communicate may be limited.

[Image via AFP]