Vasiṣṭha's teaching (Mahārāmāyaṇa) 6.28.64

6.28.64

surajjveva balīvardo badhyate janturāsthayā .
atastvayā dṛḍhamidamiti nirṇīya buddhitaḥ .. 64

64. [Sanskrit available] Therefore we should never rely in our frail and fragile bodies, but bind our souls to the firm rock of Brahma by the strong rope of our faith, as they bind a bull to the post with a strong cord.

65. [Sanskrit available] Having thus ascertained the certitude of this truth, rely thy faith on the reality of thy spiritual essence, and by giving up thy reliance on thy frail body, manage thyself with indifference in this unreal world.