A proverb meaning that belief or faith can make even something humble seem valuable — conviction changes how we value things.
お守りを大事にする彼を見て、鰯の頭も信心からだなと思った。
Seeing how he cherishes his charm, I thought 'even a pilchard's head is valued when believed in.'
効果があるか分からない薬でも、信じて飲めば楽になることがある。鰯の頭も信心からだ。
Even if a medicine's effect is uncertain, believing in it can make you feel better — it's true what they say about a pilchard's head.
彼女は小さな偶像でも大事にしている。鰯の頭も信心からというわけだ。
She treasures even a small idol. As they say, belief makes even a pilchard's head precious.