Sthitaprajna - The Steady Wise One
The stable wisdom of the realized being.
The sthitaprajna is established in wisdom - unmoved by pleasure or pain, praise or blame. Such stability comes from knowing the Self as unchanging amidst change.
When one withdraws the senses from their objects like a tortoise its limbs, that is established wisdom.
Stable wisdom is the fruit of Self-realization.
Various Upanishads