Doubts

When One has doubts, he will not achieve much.
When One has alot doubts, he will achieve nothing.

As we're exposed to more and more information from all around us, we start to question more and more of it. For questions we do not have a definite answers to, we can only speculate a conclusion. When these conclusions start to show their flaws, we get unnerved. When we get nervous, we have doubts. Doubts will then lead us to question again, and thus begin this never ending cycle.

Like a human body, The Mind can get exhausted due to "over questioning".
This is when, The Mind just shut itself out from the outside influences.
This is when Life just goes all straight down.

For doubts to be removed, there must be motivation and purpose, one as the fuel and the other as a path. This is when the mind will solely focus on this task, and gradually let go all doubts.
Find a Life Long Motivation. Live it. Fulfil it. Find someone who'll spur you on to continue towards that goal.