Nimrata is a virtue that is vigorously promoted by Gurbani. The literal translation of this Punjabi word is "Humility", or "Benevolence". The other four qualities in the arsenal are: Truth (Sat), Contentment (Santokh), Compassion (Daya) and Love (Pyar). These five qualities are essential to a Sikh and it is their duty to meditate and recite the Gurbani so that these virtues become a part of their personality.
The importance given to Humility in Sikhism can be seen from the following Shabads from Guru Granth Sahib:
Wear these three robes, O sister, and you will captivate your Husband Lord. ((127)) (Guru Granth Sahib Page 1384 line 59047)
And if you do not practise humility, truth, abstinence or self-discipline then what is in store for you:
When the Messenger of Death grabs you by your hair, you will be punished. You are unconscious, and have fallen into Death's mouth. ((3)) (Guru Granth Sahib Page 906 line 38915)