Sola Fide.

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Justification by faith alone.

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Galatians 3:6, Even as Abraham believed God, and it was accounted to him for righteousness. 

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Romans 4:3, 5, 22-25, For what saith the scripture? Abraham believed God, and it was counted unto him for righteousness. . . . But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness. . . . Cometh this blessedness then upon the circumcision only, or upon the uncircumcision also? for we say that faith was reckoned to Abraham for righteousness. . . . And therefore it was imputed to him for righteousness. Now it was not written for his sake alone, that it was imputed to him; But for us also, to whom it shall be imputed, if we believe on him that raised up Jesus our Lord from the dead; Who was delivered for our offences, and was raised again for our justification.

The gift of FAITH <– connects you –> to God’s Word of Promise (of imputed righteousness)

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In this book, see pages 63-64 for a clarifying analogy.