When I feel well and in a good humor, or when I am taking a drive or walking after a good meal, or in the night when I cannot sleep, thoughts crowd into my mind as easily as you could wish.

Mozart describes inspiration as something that arrives unbidden, especially when his body and mood are at ease—after food, during solitary movement, or in sleepless nighttime hours. The emphasis is not on laborious invention at the desk but on receptivity: ideas “crowd” in when ordinary pressures recede. The remark also suggests a practical composer’s habit of mentally working while away from the manuscript, storing musical thoughts until they can be fixed on paper. In quotation culture, the line is often used to support a romantic image of effortless genius, but its details point just as much to routine conditions that foster creativity: rest, walking, and quiet.