Jesus tells us that the seed is the word of God, and the hearers of the word are the various types of ground where the seed is sown.
Some people are like seed along the path, where the word is sown.
As soon as they hear it, Satan comes and takes away the word that was sown in them. Whenever you start to get hold of a promise of God, Satan will immediately attempt to convince you that it's impossible, it's not going to work this time, it died with the apostles, you've sinned too much, it only works for some people, or otherwise convince you that this promise can't possibly change YOUR life for the better. Once you are convinced that God means what He says and keep His promises, and you grab hold of and meditate on specific promises, faith in that area grows. This is what Satan wants to prevent from happening, because he loses control of that way to muck with your life. Satan's stolen this promise.