Wisdom from the Early Stoics, Zeno of Citium 74

The Stoics approve also of honoring parents and brothers in the second place next after the gods. They further maintain that parental affection for children is natural to the good, but not to the bad. 

It is one of their tenets that sins are all equal: so Chrysippus in the fourth book of his Ethical Questions, as well as Persaeus and Zeno. 

For if one truth is not more true than another, neither is one falsehood more false than another, and in the same way one deceit is not more so than another, nor sin than sin. 

For he who is a hundred furlongs from Canopus and he who is only one furlong away are equally not in Canopus, and so too he who commits the greater sin and he who commits the less are equally not in the path of right conduct. 

But Heraclides of Tarsus, who was the disciple of Antipater of Tarsus, and Athenodorus both assert that sins are not equal. 

—Diogenes Laërtius, 7.120-121