The five senses with the Mind, which separately form the foundations (of the Understanding), are the creations of the Understanding. They are called Indriyas or organs. When they become stained, the Understanding also becomes sullied.
अधिष्ठानानि बुद्ध्या हि पृथगेतानि पञ्चधा। इन्द्रियाणीति तान्याहुस्तेषु दुष्टेषु दुष्यति॥