[quote="Sebrina, post:1, topic:304960"]
There is a part where people make the sign of the Cross on their foreheads? Why do they do that? What does it mean? I don't do it, because I don't know why they're doing it and I don't want to mimic without knowing or I'll just look like a monkey
That is a very commendable sentiment: you don't want to make some gesture without knowing WHY you're making it.
Here's my answer from a similar question back in August:
Tracing the Sign of the Cross
As we say [Glory to you, O Lord], we trace three small crosses on our bodies: one on our forehead, one on our lips, and one over our heart. Associated with this gesture is a silent prayer which, although not written in the Missal, has been handed on for centuries:
[INDENT]May the word of the Lord
be in my mind, . . (Phil. 4:7; Heb. 10:16)
on my lips, . .. . (Deut. 30:14; Rom. 10:8-10)
and in my heart. . (Ps. 119:11; Ezek. 3:10; Luke 2:19)One variant of that silent prayer is: “May the Gospel guard my mind, bless my lips, and stay in my heart.” The idea is the same. The Douay Catechism explains the significance of this gesture this way: They sign themselves on their foreheads, to signify they are not, nor will be ashamed to profess Christ crucified: on their mouths to signify they will be ready with their mouths, to confess unto salvation: and on their breast to signify that with their hearts they believe unto justice. (p. 128)
This prayer reminds us of how attentive we must be to the Gospel.
Mind. We cannot let it go in one ear and out the other, it must remain in our minds. We cannot simply know of the Gospel, we must know the Gospel. It is not enough to know about Jesus Christ, we must know Jesus Christ, the Son of God, the Redeemer of all men. If God’s Word is in our minds, it will direct our actions and give us true peace of mind. Remember that Christ tells us that the greatest commandment is to love God with, among other things, all our mind. (cf. Luke 10:27)
Lips. In the letter of St. James, we are told about how the tongue is a truly vicious organ: The tongue is a fire. The tongue is an unrighteous world among our members, staining the whole body, setting on fire the cycle of nature, and set on fire by hell. … With it we bless the Lord and Father, and with it we curse men, who are made in the likeness of God. From the same mouth come blessing and cursing. My brethren, this ought not to be so. (Jas. 3:6-10)
We must guard our language carefully so as never to speak contrary to the Gospel. This means more than just avoiding blasphemy or denying Christ, this means making sure we are not false witnesses to Christ by the words we use. St. Paul exhorts the Ephesians, “Let no evil talk come out of your mouths, but only such as is good for edifying, as fits the occasion, that it may impart grace to those who hear.” (Eph. 4:29) And to the Colossians he wrote that they should put away “anger, wrath, malice, slander, and foul talk” from their mouths. (Col. 3:8) Jesus Christ, in His Sermon on the Mount, preached that “whoever insults his brother shall be liable” to judgment. (Matt. 5:22)
** Heart.** A well-known psalm pleads with us not to harden our hearts when we hear the voice of the Lord. (cf. Ps. 95:8) Jesus, in His parable of the sower and the seed, refers to the seed (“the word of the kingdom”) as being sown in the hearts of those who hear it. (cf. Matt. 13:19) He warns us that it is not what goes into a man that defiles him, but what comes out of his heart. (cf. Mark 7:18-22) We also read that the Blessed Virgin Mary, in the midst of all the commotion surrounding the birth of Jesus, “kept all these things, pondering them in her heart.” (Luke 2:19) The words for “kept” and “pondering” could also be translated as “treasured” and “encountered,” and this is what we are to do with the word of God: treasure it in our hearts, not to think of it fondly every now and then, but to truly encounter it.
[RIGHT]From Praying the Mass: The Prayers of the People, pp. 64-65