Why Pray?

Luke 18:1
Jesus told his disciples a story to show that they should always pray and never give up.

1 Peter 5:7
"Casting all your care upon Him, for He cares for you.

Matthew 26:41
“Watch and pray so that you will not fall into temptation. The spirit is willing, but the flesh is weak.”

Jeremiah 42:3
Pray that the Lord your God will tell us where we should go and what we should do.”

Job 42:2 
I know that You can do all things, and that no purpose of Yours can be thwarted

James 5:13-18
Is anyone among you suffering? Then he must pray.
Is anyone cheerful? He is to sing praises.
Is anyone among you sick? Then he must call for the elders of the church and they are to pray over him, anointing him with oil in the name of the Lord;
The prayer offered in faith will restore the one who is sick, and the Lord will raise him up, and if he has committed sins, they will be forgiven him.
Therefore, confess your sins to one another, and pray for one another so that you may be healed.
The effective prayer of a righteous man can accomplish much.
Elijah was a man with a nature like ours, and he prayed earnestly that it would not rain, and it did not rain on the earth for three years and six months. 
Then he prayed again, and the sky poured rain and the earth produced its fruit.