Abide in me, and I in you.As the branch cannot bear fruit of itself ,except it abide in the vine; no more can ye, except ye abide in me. John15:4
Imagine if you plant a tree in your front yard,but after awhile, you decided it would look better in your backyard. Then after few month,you realize it would be better in the front yard again so you dig it up and plant it again in the front yard. Not only will that tree fail to flourish but it will struggle to survive. Many people are like that with God almighty, they read their bible, pray go to church and after some while they stop (going back to the old self) they will never grow spiritually.
How to grow in the spirit
1.abide in Jesus always john15:4 abide mean to stay in a given place
2.walking with Jesus 1john2:6 walking speak of consistence motion
These are the only thing you need to do to grow in the spirit
Let me use this opportunity to say happy new year to you all, this is my year, your year, our year (Steemian year) for all round success 
Yes i do believe that 2019 is my year of all round success. Happy new year to @martinvictor