Jesus said, "I am the Truth." 

In a world like ours today, we can be baffled, confused and mislead; truth is no easier to find today than when Pontius Pilot asked Jesus, "What is truth?" 

But as Christians we have a sure foundation in Christ, He was clear in His words and actions, and He told the religious leaders of His day when asked what is most important - 

‘Hear, O Israel! The Lord our God is one Lord; and you shall love the Lord your God with all your heart, and with all your soul, and with all your mind, and with all your strength.’ The second is this, ‘You shall love your neighbor as yourself.’ There is no other commandment greater than these.” 

This is the foundation of all Biblical truth, without this all else is but a husk, hollow and without substance. 

Some go so far as to say, that how we treat our neighbor is the entire substance of loving God. But I will simply say, we cannot claim to have truth without both of these commands, there is no other commandment greater than these.