I have known of old that thou hast founded them for ever

Psalms 119:1Blessed are the undefiled in the way, who walk in the law of the LORD.
What is undefiled? It means to be unspoiled, not tainted. When you are walking closely with the LORD God, you are undefiled. Because your focus is going to be on Jesus Christ. You will be thinking of Him and meditating on His Word.