The first principle of the law of the harvest is the principle of faith. Imagine how much faith it took for Noah to believe what God said.
Throughout the parable of the sower [Luke 8:5–8], Christ represents the different results of the sowing as depending upon the soil. In every case the sower and the seed are the same. Thus He teaches that if the word of God fails of accomplishing its work in our hearts and lives, the reason is to be found in ourselves.