A wise person’s attitude towards future needs is rooted in the belief that “his confidence in the income and assets destined for him that are still in Hashem’s hands is even stronger than his confidence in those that he already has in his possession.” 

This is because he relies not on his possessions but on Hashem, with the unwavering faith that He will ensure that he will always have whatever he needs to sustain himself.

~ Chovos HaLevavos