金石为开
Jīn shí wéi kāi
Even metal and stone can be pierced
Any difficulty can be overcome given time and commitment. The story is of the famous archer Xiong Quzi of the Zhou dynasty. At dusk he mistook a stone for a tiger and shot an arrow at it. In the morning he found his arrow had penetrated deep into the stone. This led to the idiom that with great skill and determination the apparently impossible can be achieved.
Roughly equivalent to: The difficult we do immediately; the impossible takes a little longer.
