Do not deceive yourselves; God is not mocked: for whatever a man sows that shall he also reap. For he that sows to his flesh shall of the flesh reap corruption, but he that sows in the Spirit shall of the Spirit reap eternal life. (Galatians 6:7-8)
We can't get away from the principle of reaping what we sow. If we sow good seed, we anticipate a great harvest. But if we sow weeds, we'll harvest no more than we sowed. The same is true spiritually and practically. If we want a reward in heaven, we must live for Christ. On the other hand, if we lie, cheat, swear, steal, get drunk, use drugs, or otherwise fulfill the lusts of the flesh, the reality is we'll pay the consequences both now and in eternity. No matter how much society tries to convince us otherwise, this law has proven to be true without fail.
This is the bright truth held before us in this little book - if we sow good seed, we will reap a great harvest. While sowing and caring for the seed sown isn't without work, the promise of a great harvest is what keeps us going and what brings joy to our labors. Be assured that it is not in vain to spend much time pruning, weeding, and carefully watching over the garden of your heart and the hearts of those you love.