Human potential is never limitless, nor will it ever be.
The body and mind are limited in every way. The senses are limited in their capacity to sense the world. The mind is limited in its thinking, feeling, and willing. Even the soul is limited, being, as it is, an atomic particle of consciousness.
As souls we are all parts and parcels of the same whole. It’s like drops of water being tiny parts of the ocean, but just like a drop, even though it is part of the ocean, is never equal to the entire ocean, the soul is never equal to the unlimited whole - Krishna.
The closest the soul can come to limitless is by connecting itself with the unlimited Supreme Personality of Godhead. Sure, the soul by constitution is full of pleasure and knowledge, but it’s like a cup of water. A cup can be full of water, full to its capacity, but it’s still a limited amount of water.
God is the totality of eternity, knowledge and bliss, so when we connect with Him, we become re-situated in our original position as souls - tiny sparks of eternity, knowledge and bliss.
O learned Uddhava, those who fix their consciousness on Me, giving up all material desires, share with Me a happiness that cannot possibly be experienced by those engaged in sense gratification.
--Srimad Bhagavatam 11.14.12