The powder feels abrasive, similar to pumice powder. That's because diatomaceous earth is made of of fossilized remains of diatoms, a type of hard-shelled algae.
|Source: Princeton. Diatomaceous earth under electron microscope|
"Isaiah describes a spiritual state that existed in the time of Christ, and is often met still, when, on account of hardness of heart and love of the world, men cannot understand the gospel and be converted. It is caused by their own fault. If they would fall out with sin, and come to Christ with a broken and contrite spirit, they would be healed." Commentary
Diatomaceous earth works as a pest control agent because it pierces the exoskeleton of the pest. Hebrews 4:12 says, "For the word of God is living and active and sharper than any two-edged sword, and piercing as far as the division of soul and spirit, of both joints and marrow, and able to judge the thoughts and intentions of the heart." The Word pierces the hardened exoskeleton of sin that encases us, exposing our soft soul to the living Word. Its seed will be planted in us, and by the Spirit, may grow.
Do not be afraid to proclaim the Word at every occasion. Visualize yourself as you do so, as sprinkling diatomaceous earth. The powder lays there, ready to pierce those with whom it comes into contact, even after you are long gone. Sprinkle it liberally! It often is not welcomed because it does pierce. But the piercing is necessary to get through the exoskeleton so the seed can settle on the good ground.
"Hearken; Behold, there went out a sower to sow: And it came to pass, as he sowed, some fell by the way side, and the fowls of the air came and devoured it up. And some fell on stony ground, where it had not much earth; and immediately it sprang up, because it had no depth of earth: But when the sun was up, it was scorched; and because it had no root, it withered away. And some fell among thorns, and the thorns grew up, and choked it, and it yielded no fruit. And other fell on good ground, and did yield fruit that sprang up and increased; and brought forth, some thirty, and some sixty, and some an hundred. And he said unto them, He that hath ears to hear, let him hear." ~Mark 4:3-9
Pray for hearts to be pierced by the Word, for the heart to be prepared as good ground, and for seeds to bear fruit. Therefore may His kingdom be expanded in His glory, Amen.