“There are four things that are too mysterious for me to understand:
…a snake moving on a rock” (PV 30:19)
Snakes have four ways of moving around. Since they don’t have legs they use their muscles and their scales to do the “walking”.
Serpentine method: This motion is what most people think of when they think of snakes. Snakes will push off of any bump or other surface, rocks, trees, etc., to get going. They move in a wavy motion. They would not be able to move over slick surfaces like glass at all.
Concertina method: This is a more difficult way for the snake to move but is effective in tight spaces. The snake braces the back portion of their body while pushing and extending the front portion. It is almost like they throw themselves forward.
Sidewinding: This is a difficult motion to describe but it is often used by snakes to move on loose or slippery surfaces like sand or mud. The snake appears to throw its head forward and the rest of its body follows while the head is thrown forward again. (See picture.)
Rectilinear Method: This is a slow, creeping, straight movement. The snake uses some of the wide scales on its belly to grip the ground while pushing forward with the others.

The Bible says that we should be wise like the snakes and walk in the Spirit (1Jn 2:6; Mt 10:16). The snake walks without visible legs, mysterious, quietly and fast. Legs here stand for the flesh (noisy and slow). We should walk lead by the Holy Spirit! No more excuses for spiritual passivity! If the snake can move, you too can move on with your life! Dear friends, you should make progress, in the name of Jesus!