The verses and the meanings......1st Stanza
bhaja govindam bhaja govindam
bhaja govindam müãhamate
samprápte sannihite kále
na hi na hi raksati dukrnkarane.....
The precise meaning of this verse is "Adore the Lord, adore the Lord, adore the Lord, O fool! when the appointed time (for departure) comes, the repetition of grammatical rules will not, indeed, save you."
This verse is interesting and is probably the trigger of the sloka recited by the guru. It is believed that shankara saw a learned man teaching the pupil in kashi and emphasizing on the grammatical rules. There are other thoughts and interpretations for this as well (this one is mine).
Grammar is the building block of any language. It emphasizes on the formation of words/sentences/pronouniciations/usage and construction. The end result is nothing but a sequence of words conveying a certain meaning. Sometimes, it could be that the tone/pronouniciatio may change the meaning and emotion conveyed. But in the case of spirituality, there could be multiple paths. In the universal emotions like sympathy, happiness, sorrow ,anger and love there is no grammar. They can be realised without words and formations. The path taken by several people to self realization and realization of the supreme master (be it god/soul or faith) could be different. Some people do it through relegion, some do it under the guidance of some guru, some learn it from common people and friends, some use science....but the realization is what is important, not the path. Same as in what shankara says that the grammar is not important, but the message that needs to be conveyed is and as far as you are successful in conveying the message, thats fine.....
In many scenarios we see this in day to day life. For more than once, i have been in situation where i havent known some local language but still manage to convey the message. Emotions like love and happiness can be conveyed through just your eyes. Other qualities like affection, respect and devotion are shown through your actions. There is no specified way to do it, but you choose the way. The end result is what that matters......
Literally speaking, shankara says that reaching the supreme (could be god or your guardian angel) will happen during the time you depart your physical self. At this juncture, if at all there is something that you can carry off with you, its not your material wealth. At this juncture, what you learnt, did and earned(good deeds) in your life, which is buried deep into your subconcious mind becomes a part of your soul and is carried to the next plane. The soul is nothing but your existence in a different plane or dimension. That has no physical form, but you exist as a cloud of thoughts and values based on which you are categorized and defined.