The Lord can be served by any ingredient, even the most common commodity — a flower, a leaf, a fruit or a little water, which are available in any part of the universe and without cost and thus the Lord is served universally by the universal entities.
Srimad Bhagavatam 2.9.36,
If one practices eating prasada, even if there is some little sinful activity involved, one becomes free from the results of sinful acts.
Srimad Bhagavatam 10.10.9,
So I am always emphasizing book distribution. It is the better kirtana. It is better than chanting. Of course chanting should not stop, but book distribution is the best kirtana.
[Letter to Srutadeva Dasa 24 Oct 1974]
Always engage in devotional service with determination.