Murdu means soft. This refers to a soft mind. A mind that is soft and humble, as against a mind that is haughty, arrogant, hard, full of resentment. It is a mind that has gone into softness by the tranquillisation of those unwholesome qualities such as anger and ill-will. A soft mind is not a weak mind. This softness and uprightness goes hand in hand. One can be soft and at the same time very firmly uphold and safeguard the truth. Infact it is only a mind that is soft and humble, that can have the power of sustenance, the patience to safeguard the truth.