"...knowing that the testing of your faith produces patience." James 1:3

God doesn't test us for no reason.
He doesn't have a dice that He calls Gabriel to pull out of the closet once a week with our names on it, "Hmm, who should I test today?"

This was Job's error: he knew God was good and he didn't question his own right standing before the Lord, but he questioned God's purpose for allowing Job to suffer.

“What strength do I have, that I should hope?
And what is my end, that I should prolong my life?" -Job 6:11

Job didn't see the reason for His suffering, nor did he yet see God's complete sovereignty in His eternal purpose, therefore it was extremely difficult for him to endure. But Job defines His fault after God reveals His worthiness and glory.

“I have heard of You by the hearing of the ear,
But now my eye sees You." -Job 42:5

The testing of our faith [fidelity, assurance] produces [results in, performs, finishes in] patience [constancy, cheerful endurance, expectancy, hope] 

The word for patience in the Greek also bears this idea of submission, a coming under and abiding.

When we have experienced God's ways, God's means of growing us (usually through difficulty), we will begin to understand (oh, and this word "knowing" is "Ginosko" = knowledge through experience and relationship) how God works. We will begin to realize the hope in front of us because we know that our God doesn't do anything without purpose. We will not find it difficult to trust Him because we've seen Him come through in the past.

Here's the catch though, in order to know Him in this way, in order to be able to come under Him and trust Him and hope in all circumstances, you have to go through the trial! The first time this happens, you won't have experience to look back on. You will have to fix your eyes on Jesus and trust that He will work out His ends in your life.