As a Bible nut, I can share our point of view:
You don't really have to quote the Bible, but if you want the advice to be truly Christian, it has to be founded on Scripture. As someone who relies solely on God's Word as my source of morals, I can tell instantly if something is off.
We are told not to rely on our own understanding, but trust in God always, and seek the wisdom that comes from above. That is given through Scripture. And through the Holy Spirit, but in order to test that, we still have to rely on the Bible. So in order for it to be Christian advice, it shouldn't be your personal opinion, but rather God's opinion.
We fill our hearts with God's Word, in order to become like Him. It's what the Bible says to do.
You should be ready to give a verse if anyone asks you. If something seems off, we need to know whether the opinion is of God, or of man. If it's from man, I'm sorry, but the Bible says not to trust it.
Do you get where I'm coming from? It's not about knowing Scripture the best, but as hungry and thirsty children, we long for the wisdom of God. That is why we quote Scripture. Otherwise it doesn't edify us in Christ.
Humility is great, but that humility is supposed to be before God, not only before other people. We humble ourselves to commit to Him and to His ways. How do we learn His ways? Through Scripture.
Scripture says to diligently search Scripture, and so we do.
You need to read more. It will do you a world of good, and give you Godly wisdom.