So there’s a lot going on here but the message is very simple. Even for a native English speaker, this is some flowery language. Very heavily Christian (all the Thee’s and Thy’s and Thou’s are of course God with that Capital G) and it tries to instill humility before God.
All of this is a fancy way of saying “no matter how much I learn and achieve in life, I must never think I’ve learned or achieved more than God.”
Is or Was? Big Difference here.