If you look carefully at the construct of this verse you will discover, as did I, that the reason to approach the throne of grace boldly is to obtain resources of help in time of need. Look at the verse again rearranged: “For help in time of need, let us approach with boldness the throne of grace that we may receive mercy and find grace.”
Mercy and grace are the helps we seek in time of need. Of course, our idea of times of need and God’s may differ in situation and scope. But the key is knowing and trusting in God’s perfect timing for the provision of the mercy and grace. It always be just the right amount of mercy and grace, just the right type of mercy and grace, and just the right time for mercy and grace.
So, boldly go to the throne for the help you need and boldly trust God to provide it at the perfect time.