The Apostle John wrote, "Beloved, let us love one another, for love is from God, and whoever loves has been born of God, and whoever loves has been born of God and knows God. Anyone who does not love does not know God, because God is love."
True grace should affect our attitude toward others, and the change ought to create, what Lady Julian called, "plenty of charity toward people."
Our love for other people is a true test of our faith. If I have grown in grace, I necessarily have grown in love toward others. Any withholding of love for ANYone is proof that I have not truly been affected by the gospel of grace.
If I have been convinced that I am superior in ANY fashion (no matter how subtle) over another person or have, what Tozer calls, "a spirit of faultfinding", then I have not truly understood and been affected by grace.