Therefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labour is not in vain in the Lord.
I Corinthians 15:58

"Keeping the Church Pure"

1 John 2:15 
Love not the world, neither the things that are in the world. If any man love the world, the love of the Father is not in him.

But ye are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light;  1 Peter 2:9 

And he said, Thou hast asked a hard thing: nevertheless, if thou see me when I am taken from thee, it shall be so unto thee; but if not, it shall not be so.  II Kings 2:10

 And he said, The things which are impossible with men are possible with God. 
Luke 18:27

Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them.  Mark 11:24

But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed.  James 1:6

If ye shall ask any thing in my name, I will do it.  John 14:14