For all the wells - the Philistines had stopped them - In such countries a good well was a great acquisition; and hence in predatory wars it was usual for either party to fill the wells with earth or sand, in order to distress the enemy. The filling up the wells in this case was a most unprincipled transaction, as they had pledged themselves to Abraham, by a solemn oath, not to injure each other in this or any other respect. See Genesis 21:25-31.

his father's.

Genesis 21:30 And he said, For these seven ewe lambs shall you take of my hand, that they may be a witness to me, that I have dig this well.

had stopped. In those countries, a well of water was a great acquisition; and hence, this mode of injuring new settlers, or revenging themselves on their enemies, is still resorted to among the inhabitants.

Whether Every Lie is a Sin?
Objection 1: It seems that not every lie is a sin. For it is evident that the evangelists did not sin in the writing of the Gospel. Yet they seem to have told something false: since their accounts of the words of Christ and of others often differ from one another: wherefore seemingly one of them must have given an untrue account. Therefore not every lie is a sin. Objection 2: Further, no one is rewarded by God for sin. But the midwives of Egypt were rewarded by God for a lie, for it is stated that …
Saint Thomas Aquinas—Summa Theologica

Sundry Sharp Reproofs
This doctrine draws up a charge against several sorts: 1 Those that think themselves good Christians, yet have not learned this art of holy mourning. Luther calls mourning a rare herb'. Men have tears to shed for other things, but have none to spare for their sins. There are many murmurers, but few mourners. Most are like the stony ground which lacked moisture' (Luke 8:6). We have many cry out of hard times, but they are not sensible of hard hearts. Hot and dry is the worst temper of the body. Sure …
Thomas Watson—The Beatitudes: An Exposition of Matthew 5:1-12

The Section Chap. I. -iii.
The question which here above all engages our attention, and requires to be answered, is this: Whether that which is reported in these chapters did, or did not, actually and outwardly take place. The history of the inquiries connected with this question is found most fully in Marckius's "Diatribe de uxore fornicationum," Leyden, 1696, reprinted in the Commentary on the Minor Prophets by the same author. The various views may be divided into three classes. 1. It is maintained by very many interpreters, …
Ernst Wilhelm Hengstenberg—Christology of the Old Testament