I believe all of God's elect begin to be guided by the Holy Spirit when the Spirit regenerates them, to use a theological term. I would not call Greek and Hebrew Lexicons (such as Thayer's, Strong's, etc., or a good concordance, secular. These are the aids to which I refer since I do not currently have the inclination to learn ancient Hebrew or Greek.
I believe it important to know how the original writers of God's scripture came to use specific words and the subtlties behind specific words. Take the English word 'love'. The Greek manuscripts have different words that translated into the single English word 'love'. I believe it important to know, when reading scripture, to know which exact definition Paul had in mind (through Divine inspiration) when penning his letter.
At the current, I am accepting the canon as determined in part by the Vulgate, and later modified by Luther due to what I can not now reject as unreasonable motivations.