Can the dead see or hear the living on earth?

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sometimes people give a great perfomance in sports, music, or in life hoping that a deceased mother or father could see or understand but can the the dead see or hear, Solomon also wrote In the grave where you are going there is neither working, nor planning nor knowledge nor wisdom- Ecclestiates 9:10, how many people are praying to Mother Mary and other deceased saints? can these ones hear or see the one who is praying for them the scriptures tells us to pray but to Jeus Christ alone, there is one God and one Mediator between God and men the Christ Jesus. What are your views on this?