Gilbert was sec­re­ta­ry of the Amer­i­can Un­i­tar­i­an As­so­ci­a­tion (1908-15). His works in­clude:

• The Chris­tian Doc­trine of Non-Re­sist­ance, by Adin Bal­lou and Leo Tol­stoi (ed­it­or)
• The In­de­struct­i­ble Faith, 1916
• Thanksgiving: A Se­rmon, 1918

1. O God, Our Dwell­ing Place
2. O Trou­bled Sea of Gal­i­lee