Lord Krishna says, 'Mahatmanas tu mam partha daivim prakrtim asritah. Bhajanti ananya-manaso jnatva bhutadim avyayam'.A Mahatma knows well what is steady, what is unsteady; what is eternal, and what is temporary and perishable. Lord Krishna says, 'Such great souls (Mahatma) worship Me knowing My eternal nature (shaashvat prakruti) as the one pure Consciousness, with steadfast devotion and a one-pointed mind'.
Many times we feel that we are singing bhajans (devotional songs) and performing puja for the Divine; but we are not really singing or doing puja, because our mind is caught up elsewhere in desires, and we keep thinking that we should get this or that (Meaning: the mind races after acquiring something or the other and is not centered to the Divine in that moment) by means of doing puja.
Even when we bow down to do pranaam to the deity (offering salutations), we do not do it for our own selves, but for some selfish motive, like get a project/ tender, or something for grandchildren. When you offer worship with some self-interest in mind, then that is not worshipping the Divine with a one-pointed devotion. Then the puja, sadhana, satsang, etc., is only to fulfil the desires of our mind. How does a Mahatma do? They do everything with single-pointed devotion.They do not desire for anything else and are so happy in simply singing bhajans and praising the Divine; that they are not conscious of their body, their facial expressions, etc.
A Mahatma does not bow down before the Divine to get blessed for some goodies, but he gets so much happiness by simply doing it. He is always thanking God for his benevolence, although he may be having many difficulties. He wants to offer gratitude for having received something. He feels 'Oh! God has given me this, and that', 'God has given me such a beautiful house; got me married, given me a nice child, is keeping me mobile capable of praying, etc.
For a Mahatma, there is nothing more blissful than being one-pointed in devotion to the Divine. There is nothing else that gives him so much happiness other than just singing praises of the Divine. He finds so much joy in that. That is why it is said that a true devotee tells God, 'O God, I find so much contentment just by looking at you'. If you look at an infant, you will see that he is so contented. He does not need anything at all. The same is the case with a devotee also. He also wants Nothing.
Mahatma says, "I have received the greatest gift of all – God Himself! I need nothing more". This is the quality of a single-pointed devotion. Such a noble soul always feels, 'No matter what happens O Lord, You are always mine and I am yours forever. Whether I get something or not, You are always mine'. Having this feeling is to have a single-pointed devotion.