30 minutes ago, had the same question. Saw answer AND reference to grade school. My situation also. Brookline Mass. You?

I found this reference to your song:
https://books.google.com/books?id=zkAICgAAQBAJ&pg=PA23&lpg=PA23&dq=He+who+is+noble,+kind+in+thought+and+action,+faithful+to+duty,+pure+and+single-hearted,+needs+not+a+weapon,+needs+not+man+to+guard+him,+virtue+defends+him.+What+though+he+journey+o%27er+the+burning+desert,+what+though+he+journey+o%27er+unfriendly+mountains.+Waking+or+sleeping,+though+by+death+surrounded,+virtue+defends+him%22&source=bl&ots=YlnsBaVrAo&sig=Zss8i4w23Pbkq_OfMu3h_yXehAU&hl=en&sa=X&ved=0ahUKEwieiYix5NzTAhWCKCYKHbIXCO4Q6AEIJTAA#v=onepage&q=He%20who%20is%20noble%2C%20kind%20in%20thought%20and%20action%2C%20faithful%20to%20duty%2C%20pure%20and%20single-hearted%2C%20needs%20not%20a%20weapon%2C%20needs%20not%20man%20to%20guard%20him%2C%20virtue%20defends%20him.%20What%20though%20he%20journey%20o'er%20the%20burning%20desert%2C%20what%20though%20he%20journey%20o'er%20unfriendly%20mountains.%20Waking%20or%20sleeping%2C%20though%20by%20death%20surrounded%2C%20virtue%20defends%20him%22&f=false

I sang this song in grade school and would like to find the author and additional verses.
He who is noble, kind in thought and action, faithful to duty, pure and single-hearted, needs not a weapon, needs not man to guard him, virtue defends him. What though he journey o'er the burnning desert, what though he journey o'er unfriendly mountains. Waking or sleeping, though by death surrounded, virtue defends him. Thank you for any assistance.