As per Rasika Acharyas, the true bhajan (devotion) is when one can meditate and remember Krishna without effort.
To come to this spontaneous stage of devotion, it is necessary to follow rules and regulations of scriptures, chant nama-japa and follow the four regulative principles in a disciplined manner.
As one advances in the spiritual life further and has a desire of knowing real confidential prema-bhakti, then Krishna makes an arrangement for the sincere sadhaka (seeker) to meet a Premi Rasika Vaishnav. Read How should beginners approach spirituality if you are just beginning your spiritual journey and Advanced Cheatcodes to dive 1000x spiritually if you are practising devotee for some time.
By following the rules and regulations of Vedic Scriptures, one develops detachment from the material world. It results in realising the real perverted nature of the material world (Read Bhagavad Gita Chapter 13).
Srila Bhaktisiddhanta Saraswati Thakur Prabhupada (spiritual master of Srila Prabhupada) writes that searching for happiness in the material world is similar to a pig enjoying stool! The Bhagavad Gita clearly says dukhalayam asasvatam which means that this material world is a place of miseries. It doesn't sound right as we are still enjoying it. Right? Read this post if you wish to know why you are still enjoying this material world and what is the inner reason behind this concrete statement.
So, by following the rules of scriptures, the devotee understands the true nature of the material world, gets vairagya (detachment) and begins to search for his / her original constitutional position as an eternal soul.
By not following these rules, the vikar (conditioning) of the material world, namely - kama (lust), krodh (anger), lobha (greed), false pride, ego, envy comes inside our consciousness and diverts us away from bhajan (devotional life).
Jai Jai Shri Radhe!
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If you are considering to dive into the final goal of our Vedic Scriptures and spiritual life, and if Radharani inspires you, do get a copy of the book .
Hare Krishna!