For this people's heart is waxed gross, and their ears are dull of hearing, and their eyes they have closed; lest at any time they should see with their eyes, and hear with their ears, and should understand with their heart, and should be converted, and I should heal them." (Matthew 13:15). This is further confirmed by 1 John 2:20 that says we have an anointing from the holy one to know all things.
Anyways, we learn that those who succeeded against the devil and believed and understood God's Word had all faced three different paths. One path for some was that the cares and riches of this life choked the Word. 1 Timothy 6:10 says, "For the love of money is the root of all evil: which while some coveted after, they have erred from the faith, and pierced themselves through with many sorrows." In Mark 4:17, in various Modern Translations, they say that when persecution arises, they fall away.
So it's not that the Word is corruptible. The Word of God will always endure forever. It is about how does one apply God's Word to one's life by faith? If someone chooses to stop believing in God's Word, the LORD is not going to force them to continue to believe. If they choose to love their sin, or money more than Him, the LORD is not going to force a wicked servant who does not really love Him up into Heaven.