That's a big subject.
The eight worldly dhammas: praise and blame, gain and loss, pleasure and pain, fame and obscurity.
Right intention: according to the Buddha, are thoughts directed towards harmlessness free from ill-will and cruelty, and thoughts directed towards renunciation.
Truthfulness: well, unless we are truthful, we won't actually know what our intention is. Unless we have more awareness, we won't be able to see what is motivating us. So in order to reach the Truth and walk the path leading out of suffering, we have to begin with truthfulness to ourselves. What is motivating us? Is it based in Right Intention or wrong intention? This is where the eight worldly dhammas come in, am I doing this action, speech or thought with the intention just to get or avoid praise and blame, pleasure and pain, fame and obscurity, gain and loss? Or is it with a good intention?
This helps protect us because when we do an action, if we are more sure about our intention, then when we get the negative of these eight worldly dhammas, say blame, we may not take it to heart so quickly. We can instead examine our intention. We can look and see if our intention was good. This person blames us, okay, then by looking at our intention, we then examine whether our understanding was okay. And if we see that our understanding and our intention was okay, then if a person blames us, we can leave the blame with them, it belongs to them, we don't take it to heart. If we see that we had a good intention but we lacked understanding, then we can use that blame to avoid difficulties in the future. So we don't have to reject the blame or use it as a way to develop under-confidence about ourselves, as I was talking about mistakes before.
So understanding our intention, being truthful to ourselves, and knowing what motivates us helps protect ourselves from a lot of suffering. And if we get our intentions more in line with the Unselfish Emotions then we will have more possibility to have less Dukkha when the so called negative four of the eight worldly dhammas manifest: blame, loss, pain and obscurity; because we won't take it so personally. We realize that everybody in this world will be subject to these eight worldly conditions arising and passing. Many times it is simply beyond our power to control.
By returning to our truthfulness, and by returning to our Right Intention, we can go through the world with less confusion. We know where we want to go, and we understand our intentions, and how important they are, and we try to transform our intentions in order to protect our Kamma. This is where the reflection on Kamma – we are the owner of our own Kamma – comes in, and the importance of it; realizing that it is our responsibility to protect ourselves, realizing that we have a responsibility to care for our actions, speech and thoughts and hat is protecting and showing compassion to ourselves. It also protects us from the suffering that often comes when the eight worldly dhammas manifest in our life - as they will.