"We can but stand aside, and let them Rush upon their Fate!" highlights the unpredictability of life's outcomes and the importance of caution when facing destiny. Lewis Carroll emphasizes that rushing into certain aspects of life, like personal fate, can lead to dangerous consequences that are often unavoidable.
He warns that unlike harmless activities such as tending to gardens or balcony outings, rushing toward one's fate is fraught with risk. Once you pursue your destiny impulsively, you must accept whatever consequences arise, as it is beyond safe or easy control.