Then He said to them, "Follow Me, and I will make you fishers of men."
They immediately left their nets and followed Him.
Going on from there, He saw two other brothers, James the son of Zebedee, and John his brother, in the boat with their father, mending their nets. He called them,
and immediately they left the boat and their father, and followed Him."
Matthew 4:18-22 (NKJV)
Everyone has a favorite thing or activity of some kind, which is fine, but it is not good if our favorite thing becomes too important to us. For example, maybe someone likes a certain video game. Video games are fine, but if you quit your job, or neglect some other important obligation to play your game, then it is not a good thing. We cannot "love" our favorite thing so much that we can't leave it alone when necessary. We have to keep a proper perspective and not let our favorite thing become a problem.
In Matthew 4, we see Jesus calling Peter, Andrew, James, and John to follow Him. It is interesting to note that Jesus called them to follow Him while they were in the middle of doing something else. But it is also interesting to note that all four of them "immediately" left everything and followed Jesus when He called them. While it is clear that these four men all were doing something else when Jesus called them, they were willing to let those things go to follow Jesus.
Sometimes, Christians have a problem doing what God wants them to do, because some favorite thing in their life has become too important to them. We should love God and His will more than anything else that we might need to leave behind to do what God has called us to do. We need to be careful that we do not "love" something so much that we are not willing to leave that thing behind to go the direction that God is leading us.