Careful to lead a blameless life

Psalm 100-101
Shout for joy to the Lord, worship the Lord with gladness. Know that the Lord is God, it is he who made us, and we are his; we are his people, the sheep of his pasture.
For the Lord is good and his love endures forever; his faithfulness continues through all generations.
I will be careful to lead a blameless life.
Men of perverse heart shall be far from me; I will have nothing to do with evil.
Whoever slanders his neighbor in secret, him will I put to silence; whoever has haughty eyes and a proud heart, him will I not endure.
The Lord is God - he made us - the Lord is good. Let all the world sing and be glad. Psalm 100 is one of the best known and most often sung of all the psalms.
Hebrew title, 'by David'. The king pledges himself before God to root out evil from private and public life and to reward integrity.
Why?
God is good and his love endure forever and faithfulness continues through all generation. God is the Lord in all generation and everywhere.
No only love God but also hate the evil and do not allow the slanders and proud men stand before me.
Careful to lead a blameless life. It is David's heart, it is my purpose of life either.
How?
Men of perverse heart shall be far from me; I will have nothing to do with evil.