“The question is asked: What about the aspiration for peace of mind and heart?
Of course, this is a universal longing, and there are those who do reach a high degree of tranquility.
God weighs every person differently.
Some are judged according to their achievements and others by their failures.
No one is weighed in the balance by the peace of mind he attained but rather by the nature of his struggle and what was won in the battle.”
From “The Animal-Soul” p. 56 in The Long Shorter Way by Rabbi Adin Steinsaltz