The bible is replete with who our friends should and what Friendship should mean to us believers. Friendship is initiated whenever two or more individuals acknowledges a sense of (mutual) relevance and developed a sincere respect for (each of) the other. So we have friends even among siblings.
Friendship with mutual privilege to each other and covenant friendship is the two basic relationship a Christian needs to make a successful journey of his/her life. Get details on covenant relationship here.
Relationships are very potent for a successful journey of life. Relationships are one of the key tools God uses to purposefully work in the lives of His potential vessels. Especially, divine relationships are God’s means of taking us through to the purposes of our life.