Luke 8:14 Now the ones that fell among thorns are those who, when they have heard, go out and are choked with cares, riches, and pleasures of life, and bring no fruit to maturity.
How many times have you had the good idea and moved forward with it only to stop after some time because events in your life overtook things or you just got bored with it?
The trimmings and temptations in this world are hard to get past when you are flooding into your life.
Satan is going to use whatever means he can to make sure you do not grow as a Christian. If he can stop you before you accept Christ into your life then he has won. Any other time is just him trying to break you!