We need to believe the Word is nigh unto us, in our hearts and in our minds that we may do it. We need to believe that God has written his Laws in our hearts and in our minds; so that out of our heart we speak and do according to his will, through the Faith that He established in us through Christ.
In James 1:18 God says, Of his own will begat he us with the word of truth, that we should be a kind of firstfruits of his creatures.

Paul writes through The Spirit in Colossians, "Having put on the new man, which is renewed in knowledge, after the image of him that created him. Therefore he reasons, put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth. Lie not one to another, seeing that ye have put off the old man with his deeds".
This is what James is alluding to. That we should be a kind of first fruits of His creatures. Please lesson carefully as we continue in James 1:21, "lay apart all filthiness and superfluity of naughtiness, and receive with meekness the engrafted word."
The engrafted Word, His commandants written in the heart and mind, the Law of Liberty. The Law of freedom, freedom from the slavery of sin through the engrafted Word. For God had said through Jesus, Verily, verily, I say unto you, Whosoever committeth sin is the servant of sin. And the servant ( the sinner) abideth not in the house for ever: but the Son abideth ever. If the Son therefore shall make you free, ye shall be free indeed. John 8:34-36

Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new. And all things are of God, who hath reconciled us to himself by Jesus Christ, and hath given to us the ministry of reconciliation; To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation. Now then we are ambassadors for Christ, as though God did beseech you by us: we pray you in Christ's stead, be ye reconciled to God. For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him.


For He has said, the Word is nigh thee (engrafted) in thy mouth and thy heart that we may do it This is which is able to save your souls. Be ye doers of the word, and not hearers only, deceiving your own selves. For if any be a hearer of the word, and not a doer, he is like unto a man beholding his natural face in a glass, but forgot  what manner man he was. Which is now the new man which is after the image of Him who created him, of His own will begat He us to do by nature the things contained in the law, showing the work of the law written in our hearts, being partakers of His divine nature. But whoso looketh into the perfect law of liberty, that which is begotten of him, the new man after the image of him that created him. The first fruit of His creatures, renewed, the law, His Word engrafted in the heart and continueth therein, he being not a forgetful hearer, but a doer of the work, this man shall be blessed in his deed. (Col 3:8-10;Rom 2:14-15; 2Pe 1:3,4; Jas 1:18, 21-25; Heb 8:10 Rom 8:10 KJV)