And let us consider how to stir up one another to love and good works, not neglecting to meet together, as is the habit of some, but encouraging one another, and all the more as you see the Day drawing near.
"There are no superfluous body parts, and there are no superfluous Christians.
When you are tempted to disassociate from the local church, whether permanently or semi-permanently or even for a lazy Sunday where you just can’t be bothered, you have forgotten what you bring to the people of your church. You have neglected to understand or believe that you, yes you!, are a crucial part of the body of Christ. You have a gift to bring, and the church is only complete when you bring it and use it.
And neglecting to meet with God's people is also a "sign of overwhelming and outrageous pride. You have somehow determined either that the gifts God has given others are of no real consequence to you, or you have determined that you are so gifted that you can happily survive without. The reality, of course, is that God has made Christians to thrive and survive only in community. Lone Christians are dead Christians.
In those times where it just seems to hard to be part of a local church, and in those times where neglecting the church seems so attractive, you are forgetting what you bring and what you need. Of course you’ve also neglected to consider how badly you need the preaching of God’s Word and the celebration of the Lord’s Supper and the witnessing of baptisms and the other beautifully ordinary means of grace that God dispenses through his gathered church. But first you’ve forgotten that you are part of a body—a body you need, and a body that needs you."
(Taken from http://www.challies.com/christian-living/why-you-may-be-tempted-to-neglect-your-church )