“Blessed are the meek: for they shall inherit the earth” (Matt 5:5).
“When I have learned contentment in poverty, the next lesson is to govern my heart and temper. For what good is it to me to be without worldly things, unless I have besides a meek spirit?” -St. Ambrose
“Soften therefore your temper that you be not angry, at least that you ‘be angry, and sin not.’ It is a noble thing to govern passion by reason; nor is it a less virtue to check anger, than to be entirely without anger, since one is esteemed the sign of a weak, the other of a strong, mind.” -St. Ambrose
The earth is “that earth of which it is said in the Psalms, ‘Thy lot is in the land of the living’ (Ps 142:5), meaning the fixedness of a perpetual inheritance, in which the soul that hath good dispositions rests as in its own place, as the body does in an earthly possession, . . . such is the rest and the life of the saints.” -St. Augustine
“As by the gentleness of our minds Christ dwells in us, we also shall be clothed with the glory of His renewed body.” -St. Hilary of Poitiers
“Because it is commonly supposed that he who is meek loses all that he possesses, Christ here gives a contrary promise, that he who is not forward shall possess his own in security.” -St. John Chrysostom
“The meek, who have possessed themselves, shall possess hereafter the inheritance of the Father; to possess is more than to have, for we have many things which we lose immediately.” -Glossa Ordinaria
Quotations from St. Thomas Aquinas, Catena Aurea: Commentary on the Four Gospels Collected Out of the Works of the Fathers, Vol. I, Part I (Oxford: John Henry Parker, 1841).