when in doubt about God?

And Jesus answering saith unto them, Have faith in God. For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass: he shall have whatsoever he saith. Therefore I say unto you, What things soever ye desire, when you pray, believe that ye receive them, and ye shall have them.
Mark 11:22-24

when experiencing fear

For God hath not given us the spirit of fear; but of power, and of love, and of a sound mind.
II Timothy 1:7

For ye have not received the spirit of bondage again to fear; but ye have received the Spirit of adoption, whereby we cry, Abba, Father.
Romans 8:15

There is no fear in love; but perfect love casteth out fear: because fear hath torment. He that feareth is not made perfect in love.
I John 4:18

when troubles come into your life

The Lord is good, a strong hold in the day of trouble; and he knoweth them that trust In him.
Nahum 1:7

We are troubled on every side, yet not distressed; we are perplexed, but not in despair;
Persecuted, but not forsaken; cast down, but not destroyed;
II Corinthians 4:8,9

when waiting On God

Wait on the Lord: be of good courage, and he shall strengthen thine heart: wait, I say, on the Lord.
Psalms 27:14

My soul, wait thou only upon God; for my expectation is from him.
Psalms 62:5

Our soul waiteth for the Lord: he is our help and our shield.
Psalms 33:20