Blessed are the pure in heart for they shall see God
From the heart all issues arise and we learn from this verse that God is concerned about our hearts and its not enough to clean up our acts on the outside alone.
The heart is what you are in secret thought and feeling when nobody knows but God and what your are on the inside matters as much as what your are on the outside which is visible.
For out of the heart come evil thoughts, murder, adultery, fornication, theft, false witness, slander. These are what defile a man (Mathew 15:18-19).
We might all suffer internal battles that we cannot share but Jesus came and died for us on the cross to set us free. He paid the price and His blood cleanses our hearts when we confess our sins and accept Him as our personal Lord and Savior.
By His grace our hearts are purified and God's promise fulfilled in our lives everyday.