The basic meaning of this proverb is that you shouldn't criticise others for faults which you possess yourself. For instance, if you are in debt or have difficulty in managing money, it's not a good idea to lecture your neighbours on financial management; you will just invite them to point out your own faults. A similar proverb to this one is "The pot calling the kettle black." In the old days both pots and kettles invariably went black from the heat and smoke of the cooking fire, so the meaning of this proverb is that if you yourself have a certain characteristic (unpunctuality, for instance) you can't point it out in others.
There is a Biblical saying with the same meaning: "Before you remove the mote from your brother's eye, see that you remove the beam from your own." All these sayings point to the same idea – that it is much easier to see other people's failings than our own.
There is a Biblical saying with the same meaning: "Before you remove the mote from your brother's eye, see that you remove the beam from your own." All these sayings point to the same idea – that it is much easier to see other people's failings than our own.