Three essential requirements in meditation

Guru Nanak says in Japji Sahib
Gaviye suniye man rakhiye bhao
Sing, listen and keep love in the heart.
Saying or singing his name - any name, He has many.
Listening to what you are saying for some time and then
listening without orally saying it. The vibration stays long after you have said it.
Feel love in the heart. Remember him from the heart, otherwise what you are doing is merely a physical and mental exercise not a spiritual practice.
The mental exercise is not successful either because
'Chupe chup na hovai je lai rahan liv Tar',
the mind can't stay quiet even when sitting in meditation pose. The thoughts come and go. The only way to stop those thoughts is to feel love in the heart.
What will happen then?
Gavai ko vehe hadra hadoor.
If someone sings his name in this way, he will
see God right then and there.
So its the feeling of love that God responds to. The singing and listening is to generate the feeling. So what are you doing when quiet in meditation? Feeling Love for God and the urge to see him. If you have other desires, hoping that you will be rewarded because you are sitting in meditation pose, nothing will happen. Even to get other rewards, you need to focus on one desire at a time. Feel how much you want it and pray while in meditation. Believe that true God has the power to give anything. If you have doubt that you are not worthy of it, it will not be given. Give yourself credit and believe that you are worthy of receiving what you are asking for and you shall receive.
Jo Mange Thakur Apne Te, Soi Soi Devai
Whatever you ask, He gives all that.