老马识途

lǎomǎ-shítú

[an experienced man knows the ropes; knowledge of a veteran; an old hand is a good guid as an old horse knows the way; the devil knows many things because he is old] 比喻富于经验堪为先导

老马识途添病骨, 穷猿投树择深枝。 --清·黄景仁《两当轩集》