"See to it that no one comes short of the grace of God; that no root of bitterness springing up causes trouble, and by it many be defiled"
The Spirit, warns the believer of underlying circumstances that would allow a root to take hold within their life that would allow bitterness to take hold. Many are the reasons which cause us to question the faithfulness of God. How come? Why this? Where are You? It's taking too long, may be some of the commentary toward the Lord as we question the situation. The solution, we all could use more of His grace. It's His favor, His lovingkindness towards us, His mercy that bears us up in the time of testing. Resting in His love is a great place to be at, trusting in Him. In all things, recall His faithfulness, taking your eyes off the situation, and placing them upon Him.