This is true in all ways of life (Christian or not). If you plant bad seeds you will either not reap at all, or reap bad produce. If a business man spends hundreds of dollars on drinks for his business and neglects marketing bills, his business will collapse. This is of course a modern day example. We need to make sure that our good "seeds" are things like what we do with our time and who we spend our time with.
What is a good seed?
What is a bad seed?
Are the things you do with your time "good seeds"?