Ibn al-Qayyim writes,
"When Musa traveled to meet with Khadir, he got tired and hungry on the journey, and said to his servant, "Bring me my dinner, for this journey has made us very tired" [Kahf: 62]. For in this journey, he was traveling to another created being.
But then, when his Lord promised him a meeting for thirty full days, and He blessed him with ten more to complete forty, on Mt. Sinai, he did not eat during this meeting, nor did he feel hungry or tired. For in that journey, he was traveling to his Lord.
And so from this we learn that when the heart is on its journey to its Lord, it shall not find any pain, or tiredness, or suffering, yet when it is on a journey to another created being, it shall suffer from all of these."
From Bada’i al-Fawa’id, vol. 1, p. 72.