Whether the Seventh Beatitude Corresponds to the Gift of Wisdom?
Objection 1: It seems that the seventh beatitude does not correspond to the gift of wisdom. For the seventh beatitude is: "Blessed are the peacemakers, for they shall be called the children of God." Now both these things belong to charity: since of peace it is written (Ps. 118:165): "Much peace have they that love Thy law," and, as the Apostle says (Rom. 5:5), "the charity of God is poured forth in our hearts by the Holy Ghost Who is given to us," and Who is "the Spirit of adoption of sons, whereby …
Saint Thomas Aquinas—Summa Theologica

Whether Backbiting is a Mortal Sin?
Objection 1: It would seem that backbiting is not a mortal sin. For no act of virtue is a mortal sin. Now, to reveal an unknown sin, which pertains to backbiting, as stated above (A[1], ad 3), is an act of the virtue of charity, whereby a man denounces his brother's sin in order that he may amend: or else it is an act of justice, whereby a man accuses his brother. Therefore backbiting is not a mortal sin. Objection 2: Further, a gloss on Prov. 24:21, "Have nothing to do with detractors," says: "The …
Saint Thomas Aquinas—Summa Theologica

Whether Fasting is a Matter of Precept?
Objection 1: It would seem that fasting is not a matter of precept. For precepts are not given about works of supererogation which are a matter of counsel. Now fasting is a work of supererogation: else it would have to be equally observed at all places and times. Therefore fasting is not a matter of precept. Objection 2: Further, whoever infringes a precept commits a mortal sin. Therefore if fasting were a matter of precept, all who do not fast would sin mortally, and a widespreading snare would …
Saint Thomas Aquinas—Summa Theologica