It's best to believe, Think of it as a joy when you are tested in life. The testing of your faith produces endurance and endurance makes you mature and also makes you to lack nothing; not peace, not joy, not stamina, not wisdom, NOTHING. If you need wisdom, and we all do, ask God. He is a giver and desires to freely give His wisdom to all who ask. He desire for you to be equipped and ready and wise, lacking nothing or any good thing. When you ask Him for wisdom believe He will give it to you freely. Believe Him and do not doubt. When you doubt you are unstable like a baby's legs just learning to walk, like the waves that crash against the rocks. A double minded person can not receive from God, they are unstable in all of their ways. Make up your mind to believe and not doubt. It's best to believe.