“Effort does not guarantee success, it only removes the guarantee of failure.”
No matter how hard we work at something success is never guaranteed. All the hard effort in the world just might not be enough. But if you don’t put in the effort you are absolutely going to fail. I think the real key is how you answer this question:
If we don’t put in our best and maximum effort will we look back later and wonder if failure happened because we didn’t try hard enough?