Without this, even our best intentions and actions toward others become self-centered. Why? Because we falsely assume that it is “us” who are being good—as opposed to the Lord God working heavenly goodness through us.
However, truth without love describes an entirely different condition where simply having the right (intellectual) convictions (faith-knowledge) in our mind is believed to be enough for our eternal salvation, which is a dead faith. But love without truth is the false belief (from a principle of self-love) that we are good from our own powers.
True heavenly worship in life requires the marriage of both spiritual love and truth.