If one has a million dollars, he should not keep it, but, as long as it is within his jurisdiction, he should spend it for Krsna. Money or energy is properly utilized when it is directed to Krsna.

As soon as one quits his body, all his monetary resources and everything else that he has collected in connection with his body is finished, for the spirit soul transmigrates to another body, and one does not know where the money which he earned in his previous body is being kept or how it is being spent. A person may leave the world declaring how the money should be spent by his sons or heirs, but even if one leaves millions of dollars, in his next life he has no claim to it. Therefore as long as it is in one’s hand, it is better to spend it for a good purpose. If one spends it for bad purposes, he becomes entangled, but if he spends it for good purposes, he gets good in return.

From: “Krsna Consciousness, the Matchless Gift,” by Srila Prabhupada