Bhagavad Gita 4.12

काङ्क्षन्त: कर्मणां सिद्धिं यजन्त इह देवता: |
क्षिप्रां हि मानुषे लोके सिद्धिर्भवति कर्मजा

Translation

In this world, those desiring success in material activities worship the celestial gods, since material rewards manifest quickly.