A man does not easily shed tears - only until he reaches the point of real sorrow.
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history
This saying appears in the Ming-dynasty play 《宝剑记》 by 李开先, scene 37: 男儿有泪不轻弹,只因未到伤心处. It was widely repeated afterward and became a classic expression of traditional male emotional restraint.
usage
Often paired with the following line 只是未到伤心处. Here 弹 is read tán and means 'to drop / shed (tears)'. The phrase is frequently quoted in modern discussions reflecting on gender norms.