Epictetus, Golden Sayings 174

Everything has two handles, one by which it may be borne, the other by which it may not. 

If your brother sins against you lay not hold of it by the handle of injustice, for by that it may not be borne: but rather by this, that he is your brother, the comrade of your youth; and thus you will lay hold on it so that it may be borne. 

IMAGE: Thomas Satterwhite Noble, Forgiven (c. 1872)