Every endeavor requires land, capital, organization and labor. Just as in business one requires a place to stay, some capital to use, some labor and some organization to expand, so the same is required in the service of Krishna. The only difference is that in materialism one works for sense gratification. The same work, however, can be performed for the satisfaction of Krishna, and that is spiritual activity. If one has sufficient money, he can help in building an office or temple for propagating Krishna consciousness. Or he can help with publications. There are various fields of activity, and one should be interested in such activities. If one cannot sacrifice the results of his activities, the same person can still sacrifice some percentage to propagate Krishna consciousness. This voluntary service to the cause of Krishna consciousness will help one to rise to a higher state of love for God, whereupon one becomes perfect.