'Pure' in the Bible

“My fruit is better than gold, even pure gold,And my yield better than choicest silver.

Evil plans are an abomination to the Lord,But pleasant words are pure.

Who can say, “I have cleansed my heart,I am pure from my sin”?

It is by his deeds that a lad distinguishes himselfIf his conduct is pure and right.

The way of a guilty man is crooked,But as for the pure, his conduct is upright.

There is a kind who is pure in his own eyes,Yet is not washed from his filthiness.