Hello!
The sword represents the Word of God. Matthew 10:34 "Do not think that I came to bring peace on the earth; I did not come to bring peace, but a sword." As we know Jesus is the Word made flesh.
Matthew "For by your words you will be justified, and by your words you will be condemned."
Proverbs 18:21 "The tongue has the power of life and death, and those who love it will eat its fruit"
Mark 4:24 "Be careful of what you are hearing [listen + do]. The measure [of thought and study] you give [to the truth you hear] will be the measure [of virtue and knowlege] that comes back to you -- and more will be given to you who hear.
Meditating (pondering and thinking) on the Word is crucial to have firmly planted roots and bring forth it’s fruit, to prosper and come to maturity. The amount of thoughts and study you devote to the meditation to the Word will determine the amount of virtue and knowledge that will come back to you. Another way of saying this is that a person will get out of the word what he is willing to put into it.
So yes, go back to your studies! Your words is you weapon along with prayer. Your sword will be less effective if you do not know how to use it? And it will also be less effective if you only have pieces of it [of the word/bible]"
PS: Never throw away your sword.
You mentioned you had a girlfriend ... What type of company is she giving you ? The people you choose to 'hang around with' is actually very important. If you stay around evil minded people that are discouraging... You won't be lifted up by their 'energy'...
2 Corinthians 6:17 "Therefore, come out from among unbelievers, and separate yourselves from them, says the LORD. Don't touch their filthy things, and I will welcome you."
Ephesians 4:17-24 :
Living as Children of Light
17 With the Lord’s authority I say this: Live no longer as the Gentiles do, for they are hopelessly confused. 18 Their minds are full of darkness; they wander far from the life God gives because they have closed their minds and hardened their hearts against him. 19 They have no sense of shame. They live for lustful pleasure and eagerly practice every kind of impurity.
20 But that isn’t what you learned about Christ. 21 Since you have heard about Jesus and have learned the truth that comes from him, 22 throw off your old sinful nature and your former way of life, which is corrupted by lust and deception.23 Instead, let the Spirit renew your thoughts and attitudes. 24 Put on your new nature, created to be like God—truly righteous and holy.