moni kakku päältä kaunis, vaan on silkkoa sisältä
Finnish
Etymology
From the 33rd poem in Kalevala, Finland's national epic:
An older form of the proverb is attested already in Henrik Florinus' list of proverbs from 1702:
- Caunis cacku paͤaͤldaͤ naͤhden, acanainen alda cuoren; ei ſiunattu ſiſaͤldaͤ
- A cake is beautiful from above, chaffy beneath the crust; not blessed on the inside
Proverb
moni kakku päältä kaunis, vaan on silkkoa sisältä
- all that glitters is not gold (sometimes things, plans, promises etc. that look good on the first sight turn out to be wretched)