Open rebuke is better than secret love.

Wesley's Notes

27:5 Open - When it is needful, in which case, though it put a man to some shame yet it doth him good. Better - More desirable and beneficial. Secret love - Which does not shew itself by friendly actions, and particularly by free and faithful reproof.

Jamieson-Fausset-Brown Bible Commentary

5, 6. secret love-not manifested in acts is useless; and even, if its exhibition by rebukes wounds us, such love is preferable to the frequent (compare Margin), and hence deceitful, kisses of an enemy.

Matthew Henry's Concise Commentary

27:1 We know not what a day may bring forth. This does not forbid preparing for to-morrow, but presuming upon to-morrow. We must not put off the great work of conversion, that one thing needful. 2. There may be occasion for us to justify ourselves, but not to praise ourselves. 3,4. Those who have no command of their passions, sink under the load. 5,6. Plain and faithful rebukes are better, not only than secret hatred, but than love which compliments in sin, to the hurt of the soul. 7. The poor have a better relish of their enjoyments, and are often more thankful for them, than the rich. In like manner the proud and self-sufficient disdain the gospel; but those who hunger and thirst after righteousness, find comfort from the meanest book or sermon that testifies of Christ Jesus. 8. Every man has his proper place in society, where he may be safe and comfortable.

Matthew Henry's Whole Bible Commentary

Verses 5-6

Note, 1. It is good for us to be reproved, and told of our faults, by our friends. If true love in the heart has but zeal and courage enough to show itself in dealing plainly with our friends, and reproving them for what they say and do amiss, this is really better, not only than secret hatred (as Lev. 19:17), but than secret love, that love to our neighbours which does not show itself in this good fruit, which compliments them in their sins, to the prejudice of their souls. Faithful are the reproofs of a friend, though for the present they are painful as wounds. It is a sign that our friends are faithful indeed if, in love to our souls, they will not suffer sin upon us, nor let us alone in it. The physician's care is to cure the patient's disease, not to please his palate. 2. It is dangerous to be caressed and flattered by an enemy, whose kisses are deceitful We can take no pleasure in them because we can put no confidence in them (Joab's kiss and Judas's were deceitful), and therefore we have need to stand upon our guard, that we be not deluded by them; they are to be deprecated. Some read it: The Lord deliver us from an enemy's kisses, from lying lips, and from a deceitful tongue.