Our emotions are very powerful signs of what is going on within us.
They are also very critical indicators of what we intend to do next.
If we are feeling high with love, then we may feel that nothing is too difficult to accomplish and no sacrifice is too painful to be offered.
But if we are angry and downcast, then those emotions are certainly warning signs of danger.
And if the anger is left burning, then it will become a destructive fire that will burn others as well as ourselves.
In the 1st reading, God warned Cain that his anger and his ill disposition is like a crouching beast hungering to devour him and cause him to sin.
But Cain did not heed the signs nor check himself. Instead he gave in to his anger and ill disposition and ended up killing his brother Abel.
God always gives us the signs of what is happening within us. God also gives us signs of impending danger.
There is no need to ask for a sign. What we need to ask for is that we be sensitive to the signs that God is giving us.
Then we will know what God is showing us and that we steer clear of danger and that we will always do the good and right thing.