Wilberforce's Healthy Self-Forgetfulness

From John Piper's Amazing Grace in the Life of William Wilberforce:

There was in this child-like love of children and joyful freedom from care a deeply healthy self-forgetfulness. Richard Wellesley, Duke of Wellington, wrote after a meeting with Wilberforce, "You have made me so entirely forget you are a great man by seeming to forget it yourself in all our intercourse." The effect of this self-forgetting joy was another mark of mental and spiritual health, namely, a joyful ability to see all the good in the world instead of being consumed by one's own problems (even when those problems are huge). James Stephen recalled after Wilberforce's death, "Being himself amused and interested by everything, whatever he said became amusing or interesting. . . . His presence was as fatal to dullness as to immorality. His mirth was as irresistible as the first laughter of childhood."