In the essential beliefs, we need unity.
"There is one Body and one Spirit... there is one Lord, one faith, one baptism, one God and Father of all..." (Ephesians 4:4-6)
In the non-essentials, we need freedom.
"Accept him whose faith is weak, without passing judgment on disputable matters... Who are you to judge... Each of us will give an account of himself to God... So whatever you believe about these things, keep between yourself and God." (Romans 14:1, 4, 12, 22)
In all our beliefs, we need love.
"If I have the gift of prophecy and can fathom all mysteries and all knowledge, and if I have a faith that can move mountains, but have not love, I am nothing." (1 Corinthians 13:2)