As clean, pure, etc. as the driven snow
Definition 1 of 1
Pro Tip 1/3Idiomatic Origin
Originates from fresh snow's appearance, symbolizing purity and untainted quality. 
Her thoughts were as pure as the driven snow, untouched by malice.
Pro Tip 2/3Metaphorical Use
Used metaphorically to emphasize extreme purity or innocence, often overstated or idealized. 
Despite the accusations, he maintained that his intentions were as clean as the driven snow.
Pro Tip 3/3Emotional Impact
Carries a positive emotional weight, suggesting integrity or moral high ground. 
She always viewed her grandmother's advice as pure as the driven snow.