God is Truth. God is the truth and reality of all things. God's own body is manifest as everything, all of creation. And God is the truth of the interrelationship between things, the connecting tissue between things.
Further, God is the way things work. God is the perfect Designer and the perfect Design. God's Way is the way of Truthfulness -- the way in which we are true to who we are, as God created us to be. In God's Way, we are self-honest -- honest in our thinking, and in what we express. Aligned to the Design. True to our True Self.
God's Way works. And therefore, God's Way is the true way. God is in the is-ness business. When you're in your Father's business, you are in Reality.
Such is the connection between God and Truth.