Matthew 7:3

And why do you behold the splinter (or ‘speck of sawdust') that is in your brother's eye,

But do not consider the plank that is in your own eye?

Jesus had a full understanding of the weaknesses of men. Elsewhere He says quite blatantly to His disciples, “If you then, being evil ---” (Matthew 7:11; Luke 11:13). There He assumes evil, even in His own disciples, for He knew to its full depths the heart of man. Here therefore He makes clear that He is well aware that even good Christian men walk around with planks, or more accurately ‘large beams', such as hold up the roof of a building, in their eyes. In other words that they are regularly guilty of wrong behaviour and attitudes, and of seeing things wrongly, and especially in cases such as these of judging from prejudice or some other false motive, and doing so hypocritically. It is a sad truth that there is often nothing more plain to us than the faults of others, especially if we do not like them or they are rivals, while remarkably we find our own many faults very difficult to spot, because our eye is not ‘single'. We see the sins of others as being as dark as can be. But we think on the other hand, that our own failures are mere peccadilloes, and fully understandable. We ‘condone the sins we are inclined to, by damning those we have no mind to'. Ours we see as only the slightest of sins, almost no sins at all (even though they crucified Christ), while we often see the sins of others as being of deepest dye. Jesus' point, however, is that until things are the other way round and we recognise the grossness of our own sins, and that the sin of our brother or sister is therefore the one that is the more understandable, we are in no fit state to help them. And the reason that we do not see it like that is because of the plank that is in our eye which prevents us from seeing properly. Spiritually we have defective vision. Our eye is failing to be the lamp of our body (Matthew 6:22). Thus our first move must be to get rid of that plank.