There are several views on this topic, but in this post we will see what the Advaita scriptures say and what Shankara has written on this in his commentaries.
In some texts that are attributed to Shankara, such as Vivekachudamani, the case is clearly presented – these texts clearly state that Samadhi is definitely required for Self-Realisation to occur. Whilst this is the most widely held view, and by far the dominant traditional view for at least the last one thousand years and more, and also the view of the four Shankara Mathas that have been entrusted with handing down Shankara’s Advaita Vedanta tradition to each generation, there are a minority who state that Vivekachudamani is not a genuine work of Shankara.
Therefore in this post we will look at what was written by Shankara in his commentaries, the authorship of which is not in doubt:
Please see this link here to read the discussion of this topic.