Shanice, the best way to know ourselves is through the words of the Bible.
Hebrews 4:12 "For the word of God is alive and exerts power and is sharper than any two-edged sword and pierces even to the dividing of soul and spirit, and of joints and [their] marrow, and [is] able to discern thoughts and intentions of [the] heart."
Also, through Bible-based publications we can learn more about ourselves. In the recent district convention there was a symposium that spoke about the different types of figurative hearts: half heart, double heart, cunning heart and want of heart. Through this symposium, I actually learned a couple of things about myself that made me think of changes or adjustments I need to make. Sometimes it hurts, but how else will we know that we need to make changes?