In this verse there are two significant words: yogena, by the approved method, and drstena, as exemplified by the former acaryas. One is mistaken if he thinks that by applying modern machines such as tractors, grains can be produced. If one goes to a desert and uses a tractor, there is still no possibility of producing grains. We may adopt various means, but it is essential to know that the planet earth will stop producing grains if sacrifices are not performed. The earth has already explained that because nondevotees are enjoying the production of food, she has reserved food seeds for the performance of sacrifice. Now, of course, atheists will not believe in this spiritual method of producing grains, but whether they believe or not, the fact remains that we are not independent to produce grain by mechanical means. As far as the approved method is concerned, it is enjoined in the sastras that intelligent men in this age will take to the sankirtana movement, and by so doing they shall worship the Supreme Personality of Godhead Lord Caitanya, whose bodily complexion is golden and who is always accompanied by His confidential devotees to preach this Krsna consciousness movement all over the world. In its present condition, the world can only be saved by introducing this sankirtana, this Krsna consciousness movement. As we have learned from the previous verse, one who is not in Krsna consciousness is considered a thief. Even though he may be materially very advanced, a thief cannot be placed in a comfortable position. A thief is a thief, and he is punishable. Because people are without Krsna consciousness, they have become thieves, and consequently they are being punished by the laws of material nature. No one can check this, not even by introducing so many relief funds and humanitarian institutions. Unless the people of the world take to Krsna consciousness, there will be a scarcity of food and much suffering.