Proverbs 15:8 The sacrifice of the wicked is an abomination to the Lord, But the prayer of the upright is His delight.
What do you think of people who constantly tell lies? What do you think of someone who constantly steals things?
When we do things against other people we are also doing those things against God. Each of us is a child of God and so we need to make sure we keep our eyes focused on Him.
When we do things wrong we upset a whole lot more than just the people around us, we upset God, we upset the people watching and the people involved.
But lifting up our prayers with humble hearts is like someone singing a gentle melody to Him. God loves it!