: The Art of Manliness connects the phrase to Platonic ideas of "recollection" and avoiding the forgetfulness of truth. Woodworking & Tools

: Charles Spurgeon’s sermon "The Hold Fast" explores Proverbs 4:13, describing faith as a "fast hold" upon divine instruction, similar to a drowning man gripping a plank.

In woodworking, a holdfast is a traditional L-shaped metal clamp used to secure workpieces to a workbench.

In biology, a is a root-like structure that anchors organisms (like kelp or seaweed) to rocks or other surfaces.

: The University of Rhode Island explains how holdfasts provide protected environments for juvenile fish and other marine life.