The Bible has many references to Grace and Truth. One verse is John 1:14: The Word became flesh and made His dwelling among us. We have seen His glory, the glory of the one and only Son from the Father, full of grace and truth.
These two elements, Grace and Truth, are in a constant state of tension within every Christian; too much of either one will lead to a Christian life that is crooked and does not reflect God’s desire.
Randy Alcorn has an interesting article on this topic, taken from his book, The Grace and Truth Paradox. Here is a link to that article.