Spiritual Gain
For Financial gain you need finance experts, similarly, For Spiritual gain you need association of devotee.
Associating Directly With God
To chant God’s holy name means to associate directly with Him.
Result of Association with Devotees
One should learn how to associate with the devotees of the Lord by gathering with them to chant the glories of the Lord. This process is most purifying. As devotees thus develop their loving friendship, they feel mutual happiness and satisfaction and by thus encouraging one another they are able to give up material sense grantification, which is the cause of all suffering. — Srimad Bhagavatam, 11.03.30.
Happiness of The Spirit Soul
The spirit soul can be happy only in the association of the supreme living being, the Personality of Godhead, and nowhere else.
Srimad Bhagavatam 3.2.11,
Srila Prabhupada.
Association
Association of saintly persons alone can bring us eternal peace and everlasting happiness and carry us across the ocean of birth, old age, disease and death.
Associating With Krishna
When we keep our association with Krishna, every activity is proper and liberating, but if we disassociate ourselves from the Lord's mercy then like a hand which is severed from the body we become ugly and useless. — In his letter to Hrisikesa, 26th Nov, 1968.