Matthew Poole and continuators on Proverbs 26:16

16 The sluggard is wiser in his own conceit , than seven men that can render a reason .

Because by his idleness he avoids those troubles and dangers to which other men by their activity expose themselves, forgetting in the mean time what reproach and loss, and how much greater mischiefs, both here, and hereafter, are brought upon him by his slothfulness.

To wit, a satisfactory reason of all their actions, i. e. who are truly wise men.