They fully intend to topple him
from his lofty place;
they take delight in lies.
With their mouths they bless,
but in their hearts they curse.
As the Psalmist wrote these words, he had in mind those who were out to get him, to bring him down. You may not have any people who are wanting to do that, but many times we have the lusts in our own hearts that are aiming at the same end.
The Bible says that the heart is deceitful and desperately wicked. Many times our own hearts are lying to us. The inner self is seeking to meet its own needs. It is telling us the wrong things.
Maybe it is telling you that some particular thing isn't actually wrong, when you know it is. Maybe your heart is telling you that you simply can't do something, you are not worthy of service to the Lord, when you know that is a false humility to disguise your fear of man or your laziness.
Whatever is trying to topple you down... seek the strong refuge of Christ. Allow His words of truth to penetrate your deceptive heart.