How can I "not judge" but still say the truth to my brother?

What is the Lord teaching in Matthew 7:6?

In verses 1-5, we are to help our brother, seeking to remove a problem ( or "mote") that limits his usefulness or joy (a clouded or uncomfortable eye). To do so requires self-judgment and fairness (verse 5). Sometimes, even when self-judgment and fairness are present, attempts to help may be unfruitful (verse 6).

Since dogs and pigs are unclean animals, the Lord indicates that unbelievers (the unclean) can neither enjoy (dogs) nor rightly evaluate (pigs) spiritual things. While we are responsible to "do good unto all men" (Galatians 6:10), treating unbelievers as though they were believers is unwise. We must present the gospel to them, but need not expect to elevate them by presenting principles of Christian living to them. Doing so may both endanger our effectiveness with them ("rend you") and further reduce their regard for truth ("trample them under their feet").

The Lord condemns harsh judgment (verse 1), but commends spiritual judgment (verse 6). We are responsible to know how best to help others (verses 1-5, "then thou shalt see clearly"), but to recognize when well-intended help is counterproductive (verse 6). In both cases, our constant recourse is prayer (verses 7-11)

D. Oliver