安如泰山
Safe upon the solid rock.
eg：His position is safe upon the solid rock after he gave your recommendation letter to his boss.
中英俚语俗语来源：文选·枚乘谏吴王书：“乘所欲为，易于反掌，安于泰山。”
同义词：固若金汤 As firm as a rock.
反义词：危在旦夕 Hang on by the eyelids.
