As you think so you become – Astavakra Samhita – Chapter 1 Verse 11

मुक्ताभिमानी मुक्तो हि बद्धो बद्धाभिमान्यपि।
किंवदन्तीह सत्येयं या मतिः सा गतिर्भवेत्।।1.11।।

mukta abhimaani muktohi baddho baddhaabhi maanyapi
kim badantiha satyeyam yaah matih saa gatirbhabet

Astavakra Samhita – Chapter 1 Verse 11

Take care of your thoughts and you take care of your destiny. He who considers himself liberated is liberated indeed. He who considers himself bound remains bound. The popular saying, “As you think, so you become,” is quite true.