expression
too much thinking gets you nowhere; excessive enthusiasm clouds one's judgment
Proverb warning that overthinking or obsessing over something leads to poor decisions or inaction.
凝っては思案に能わずというから、少し頭を冷やしたほうがいい。
They say too much thinking gets you nowhere, so you should cool your head a bit.
The exact origin is uncertain; it is a traditional Japanese proverb.