People
The three hardest tasks in the world are neither physical feats nor intellectual achievements, but moral acts: to return love for hate, to include the excluded, and to say, "I was wrong."
— Sydney J. Harris

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The hardest tasks are said to concern how we treat people, not how strong or clever we are. Love, welcome, and an admission of fault each demand something difficult. The list places everyday moral choices beside the feats people more often praise.
Context reviewed