In next verse Krishna says if we will not do this then what will happen

BG 2.66

nasti buddhir ayuktasya

na cayuktasya bhavana

na cabhavayatah santir

asantasya kutah sukham

SYNONYMS

na asti — there cannot be; buddhih — transcendental intelligence; ayuktasya — of one who is not connected (with Krishna consciousness); na — not; ca — and; ayuktasya — of one devoid of Krishna consciousness; bhavana — fixed mind (in happiness); na — not; ca — and; abhavayatah — of one who is not fixed; santih — peace; asantasya — of the unpeaceful; kutah — where is; sukham — happiness.

TRANSLATION

One who is not connected with the Supreme [in Krishna consciousness] can have neither transcendental intelligence nor a steady mind, without which there is no possibility of peace. And how can there be any happiness without peace?

nasti buddhir ayuktasya, For one who is not connected with Krishna then it is nasti buddhir such a person does not have any buddhi, bhavana => Steady mind, …there is no peace there is no happiness.

It is an important sequence to understand.

Unless there is a basic level of peace, there cannot be happiness. Peace comes when our mind and intelligence are focused. If we are not in KC (Krishna consciousness), then the subtle body is not fixed. The mind and intelligence go here and there at such a pace that we lack steadiness, resulting in no peace. Na cabhavayatah santir, this peace is not merely external (it doesn’t mean that devotees have no anxiety or are living on a riverside in the jungle), but it is internal. It means knowing my goal and working towards it, making conscious choices about what I will do and what I will not do. Although a devotee may desire external peace as well, it is to ensure uninterrupted endeavor in KC.

Srila Prabhupada quotes the peace formula in 5.29, which we will discuss when we get there, but he said disturbance is due to a lack of an ultimate goal.

If we don’t have an ultimate goal, then we won’t find true happiness, as material goals cannot provide us with the amount of happiness we truly seek. They are temporary, and we end up wanting more and more. Therefore, it is crucial to have an ultimate goal and work towards it.

This is how our mind deludes us, and we feel captivated by illusion.

The ultimate goal is a relationship with Krishna, and if I serve Krishna, the way may be different for each individual, but the principle remains the same. It is not merely about wanting this or that thing in the world. While we may have certain material desires, what we essentially desire is to love Krishna, and the things we want in the world are to enable us to serve Krishna more steadily.

In general, a person’s appearance and substance may not be the same. External peace does not always indicate internal peace. For instance, Western countries may appear very clean externally, but internally people may be contaminated.