He requires of us a perfect faith, and He tells us that if we believe and doubt not, we shall have whatsoever we ask. The faintest touch of unbelief will neutralize our trust.
But how shall we have such perfect faith? Is it possible for human nature? Nay, but it is possible to the Divine nature, it is possible to the Christ within us. It is possible for God to give it; and God does give it. But Christ is the Author and Finisher of our faith, and He bids us have the faith of God, and as we have it through the imparting of the Spirit of Christ, we believe even as He.
We pray in His name, and in His very nature, and we live by the faith of the Son of God who loved us and gave Himself for us. The love that He requires of us is not mere human love, nor even the standard of love required in the Old Testament, but something far higher. The new commandment is, Love one another, not as yourselves, but as I have loved you.
How shall such love be made possible? Herein is our love made perfect, because as He is so are we also in this world. Our love is simply His love wrought in us, and imparted to us through the Spirit.