A pure devotee may be attracted to accumulating wealth just like an ordinary man, but the difference is that a devotee acquires money for the service of the Lord, whereas the ordinary man acquires money for his sense enjoyment. Thus the acquisition of wealth by a devotee is not a source of anxieties, as is the case for a worldly man. And because a pure devotee accepts everything in the sense of serving the Lord, the poisonous teeth of accumulation of wealth are extracted. If a snake has its poison removed and bites a man, there is no fatal effect. Similarly, wealth accumulated in the cause of the Lord has no poisonous teeth, and the effect is not fatal. A pure devotee is never entangled in material worldly affairs even though he may remain in the world like an ordinary man.
(Prabhupada purport SB 3.9.6)