have a mind as open as a valley-be extremely modest (/open-minded); be free from pride and prejudices;have a mind open to all ideas and thoughts; have no preconceived ideas;make a great show of humility; not biased ❍ 郑孝胥为了拉拢下级司员，表示～，倾听下情，……(爱新觉罗·溥仪《我的前半生》160) In order to win over his subordinates Zheng made a great show of humility and of listening to what they had to say.
虚怀若谷
have a mind as open as a valley;be of receptive mind;be extremely open-minded;be very modest
虚怀若谷xū huái ruò ɡǔ
谷：山谷。形容人胸怀谦虚，如同山谷一样深广。be very modest, great humility, not biased, be extremely open-minded