SB 7.15.20
kamasyantam hi ksut-trdbhyam
krodhasyaitat phalodayat
jano yati na lobhasya
jitva bhuktva diso bhuvah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The strong bodily desires and needs of a person disturbed by hunger and thirst are certainly satisfied when he eats. Similarly, if one becomes very angry, that anger is satisfied by chastisement and its reaction. But as for greed, even if a greedy person has conquered all the directions of the world or has enjoyed everything in the world, still he will not be satisfied.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
In Bhagavad-gita (3.37) it is stated that lust, anger and greed are the causes of the conditioned soul’s bondage in this material world. Kama esa krodha esa rajo-guna-samudbhavah. When strong lusty desires for sense gratification are unfulfilled, one becomes angry. This anger can be satisfied when one chastises his enemy, but when there is an increase in lobha, or greed, which is the greatest enemy caused by rajo-guna, the mode of passion, how can one advance in Krsna consciousness?
If one is very greedy to enhance his Krsna consciousness, this is a great boon. Tatra laulyam ekalam mulam. This is the best path available.