Faith comes by HEARING and HEARING and HEARING the word of God or scriptures - Romans 10:17. So, God changed the darkness to light by SPEAKING words, which He BELIEVED and HEARING them - Genesis 1:3, Jesus changed a stormy situation to a calm situation by SPEAKING words, which He BELIEVED and HEARING them - Matthew 8:26, and Ephesians 5:1 says, 'be imitators of God, copy Him and follow His example, as children imitate their father'. So, you too can change your sadness to joy, your darkness to light, your stormy situations to calm situations by BELIEVING and then SPEAKING or READING the word or scriptures and HEARING and HEARING and HEARING, the word or scriptures, daily.  

You have shown me the path of life; in your presence is fullness of joy; at your right hand are pleasures forevermore - Psalm 16:11(NKJV)

For your anger is, but for a moment, your favor is for life; weeping may endure for a night, but joy comes in the morning - Psalm 30:5(NKJV)

Those who sow in tears, shall reap in joy. He(she) who continually goes forth weeping, bearing seed for sowing, shall doubtless come again with rejoicing, bringing his(her) sheaves with him - Psalm 126:5-6(NKJV) 

To be continued