Our car keeps track of the gas mileage on an ongoing and cumulative basis. I can watch a graphic display that tells me how I have been doing for the last 15 minutes and the display by the odometer tells me how it has done since it was last reset. Until a couple of weeks ago, it had not been reset since a month after we bought the car 2+ years ago. I accidentally reset it while trying to do something else (tech whiz huh!). So, before this recent reset, it took many miles of high mileage driving on the graph to raise the long-term mileage by even 1/10 mpg. Conversely, an all day trip from grocery store to doctor to hardware in traffic might not lower it at all. Now, just coming down the 4/10 mile driveway can lower that "long term" mpg by a couple of tenths and the 22 mile road trip to town will raise it right back up. The sheer mass of the data in the old system kept every trip from having significant impact on the bottom line reading.
When a large heavy object (mass) is moving (momentum) quickly it is difficult to stop. Its mass and momentum give it a lot of power. A Civil War general saw a cannonball rolling across the field toward his staff and laughed and put out his foot to stop it. He lost the foot. On the other hand, the third baseman can catch the 100+ mph line drive with little difficulty.
Church is "for the perfecting of the saints, unto the work of ministering, unto the building up of the body of Christ: till we all attain unto the unity of the faith, and of the knowledge of the Son of God, unto a fullgrown man, unto the measure of the stature of the fulness of Christ: that we may be no longer children, tossed to and fro and carried about with every wind of doctrine, by the sleight of men, in craftiness, after the wiles of error;" (Eph 4:12-14). New Christians are like the reset mileage counter—they have no mass of data (faith, knowledge, experience) to stabilize them. Every wind of doctrine or trickery of men used by Satan pushes them off course. Today, they are on the highway on cruise control and racking up the high mileage. Tomorrow, they are bumping down the driveway in low gear and dragging the numbers down. Church shares the mass and momentum of older Christians and teachers and elders in order that the weaker are not tossed about before they have their own mass and momentum built up.
I think that after 50+ years, it would be a shame if we were going to church to learn and be built up. Of course, we do sometimes learn some new thing and are often encouraged by the faith of others. But, we certainly ought to have our own faith grown large and rolling downhill by now. We should be there to supply to the increase of the body building up itself in love. We should focus on the joy of each level of progress of others and our part in that growth. Certainly we still grow, we have lightbulb moments that open new appreciation for God's grace or open new avenues of service. But, primarily we are there for others.
It is certainly a shame when a member of 10 or more years "in the church" is such a babe that he has to be coddled and is complaining he did not get anything out of the services.
For though by this time you ought to be teachers, you have need again for someone to teach you the elementary principles of the oracles of God, and you have come to need milk and not solid food. (Heb 5:12)