Welcome to Dhamma Wheel!
Can you clarify what you know of the "4 states to nibbana" as I've not come across this expression before?
The first thing that comes to mind is the four levels of noble ariyan Sangha (stream-entrant, once-returner, non-returner, arahant) but wonder whether you're asking about the 4 Noble Truths, the 4 Divine Abidings or some else altogether.
"Having understood name-and-form, which is a product of prolificity,
And which is the root of all malady within and without,
He is released from bondage to the root of all maladies,
That Such-like-one is truly known as 'the one who has understood'." (Snp 3.6)
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)