Read the aphorism. Write injuries in dust, benefits in marble. What important idea does this aphorism from Benjamin Franklin's Poor Richard's Almanack convey?

Do not remeber the injuries, remeber the blessings

This aphorism means that "injuries" (which can be related to problems, disagreements, a harmful or painful situation) can be easily disappear just as dust do with a simple puff of air). On the other hand, the benefits you get by experiencing a conflict or a worrying situation will last for ever in the same way a craftsman caves into marble. All in all, people should look at the good side of things rather than the negative ones.