Because of what Christ said, we can understand that it is not impossible for us to redirect our energies and feelings. If we tie Galatians 6:7-10 to Colossians 3:1-4 and Revelation 2:1-7, we can see that Paul was saying that the rewards are in the doing—in the works. As Christ said, "I know your works." The solution is, "You need to redirect your energies, go back to your former devotion. And, if you have the right devotion, if you show real love, then the right works will come, and you will overcome."
God's way is such that it begins producing the good soon, not late. The apostle is saying that, if we begin sowing the right seed, we will soon begin to reap the fruit of the harvest to come because God's Word always produces results. God says that His Word will not go forth and return empty. We can be assured that fruit will be produced if we sow the right things, if we turn our energies to the way they should be.
The harvest, then, begins to be reaped—soon, in the sense of well-being, a sense that things are well between us and God. John 3:21 and the next several verses tie in here so well. So in the Ephesian church, as well as the whole church era, the members' lack of love was showing in what they were doing. Ignorance was not motivating them, but a loss of affection for Christ (Revelation 2:4-5). This is serious business. If there is no love for Christ, there is no salvation (I Corinthians 16:22).