Just as we grow and change physically we ought to be growing and changing in our walk with the Lord. It is sad to see people who have sat in church for years and years who are still immature in Christ. A common saying is "people don't change." Well, thankfully, God is in the change and transformation business but it does require some response from us.
Too many people blame God for their issues. I once had a guy complain to me about his struggles with lust. He said he had prayed about it and couldn't understand why God had not taken it away from him. Like a lot of folks he was blaming God for his sin but Jesus already paid for it! I talked to him about renewing his mind and bringing every thought to the captivity of Christ (2nd Co. 10:5). The problem we have is that that path requires a little work and discipline on our part. I'd rather just pray a quick prayer and have the Lord remove the feeling.
Growing in the Lord requires some pressing in. We need to spend some time in the Word and in fellowship with the Lord -- hopefully each day. We need to be doers of the Word and not hearers only. We need to make good decisions about what we watch and listen to. Growth requires something of us. It doesn't just happen magically. The Lord is there for us and walks with us through the process. It takes time but it will happen.
"Brethren, do not be children in understanding; however, in malice be babes, but in understanding be mature." (1st Co. 14:20)