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Faith is the victory that over cometh the world.
For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even our faith. 1 John 5:4

If you have faith the size of a mustard seed you shall say to this mountain move and it shall move.
And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you. Matthew 17:20

If a man utterly abandons his own ways in favor of the ways of God, he has already overcome the world and the Grace of Jesus Christ abounds in him.
And when he had called the people unto him with his disciples also, he said unto them, Whosoever will come after me, let him deny himself, and take up his cross, and follow me. Mark 8:34
Who is he that overcometh the world, but he that believeth that Jesus is the Son of God? 1 John 5:5
How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God? Hebrews 9:14

If we are willing to abandon even the smallest of our own things in favor of God (faith as a mustard seed) then the mountain of the Lord (Jesus Christ) shall move and His Grace shall be applied.
Matthew 19:28  And Jesus said unto them, Verily I say unto you, That ye which have followed me, in the regeneration when the Son of man shall sit in the throne of his glory, ye also shall sit upon twelve thrones, judging the twelve tribes of Israel.
29  And every one that hath forsaken houses, or brethren, or sisters, or father, or mother, or wife, or children, or lands, for my name's sake, shall receive an hundredfold, and shall inherit everlasting life.
30  But many that are first shall be last; and the last shall be first.

By dying to self we can live in Him.
Luke 9:22  Saying, The Son of man must suffer many things, and be rejected of the elders and chief priests and scribes, and be slain, and be raised the third day.
23  And he said to them all, If any man will come after me, let him deny himself, and take up his cross daily, and follow me.
24  For whosoever will save his life shall lose it: but whosoever will lose his life for my sake, the same shall save it.
25  For what is a man advantaged, if he gain the whole world, and lose himself, or be cast away?

What brings defeat then is the clinging to your own ways.
¶The backslider in heart shall be filled with his own ways: and a good man shall be satisfied from himself. Proverbs 14:14
Isaiah 58:13  ¶If thou turn away thy foot from the sabbath, from doing thy pleasure on my holy day; and call the sabbath a delight, the holy of the LORD, honourable; and shalt honour him, not doing thine own ways, nor finding thine own pleasure, nor speaking thine own words:
14  Then shalt thou delight thyself in the LORD; and I will cause thee to ride upon the high places of the earth, and feed thee with the heritage of Jacob thy father: for the mouth of the LORD hath spoken it.