I remember that in my childhood I used to observe with great care and admiration the change that some animals underwent; On one occasion I was invited by a scout friend and watched a lot of tadpoles in the water, some in the process of transformation and others with both hind legs. Nearby, in what I remember was a kind of pasture, little frogs were jumping and running away from me.

Something similar happens with the caterpillar, it builds a cocoon to inhabit it, to later become a beautiful and expressive butterfly.

The dark thoughts and murky dispositions of the heart, as in a "protective cover", are hermetically enclosed to prevent the liberating light of truth from passing through; forming a condition of disorder, suffering and death within us.

But when the power of the blood of Christ destroys this shell of evil that disturbs the conscience, it changes the sinful nature, emerging life for freedom of the soul.

Romans 6:6-8 NKJV

6 knowing this, that our old man was crucified with Him, that the body of sin might be done away with, that we should no longer be slaves of sin. 7 For he who has died has been freed from sin. 8 Now if we died with Christ, we believe that we shall also live with Him,

Ephesians 2:3-6 NKJV

3 among whom also we all once conducted ourselves in the lusts of our flesh, fulfilling the desires of the flesh and of the mind, and were by nature children of wrath, just as the others.
4 But God, who is rich in mercy, because of His great love with which He loved us, 5 even when we were dead in trespasses, made us alive together with Christ (by grace you have been saved), 6 and raised us up together, and made us sit together in the heavenly places in Christ Jesus,