Your Faith is Your Fortune is a classic metaphysical work by Neville Goddard.
Man can decree a thing and it will come to pass.
Man has always decreed that which has appeared in his world. He is today decreeing that which is appearing in his world and he shall continue to do so as long as man is conscious of being man.
Nothing has ever appeared in man's world but what man decreed that it should. This you may deny; but try as you will you cannot disprove it for this decreeing is based upon a changeless principle. Man does not command things to appear by his words which are, more often than not, a confession of his doubts and fears. Decreeing is ever done in consciousness.
Every man automatically expresses that which he is conscious of being. Without effort or the use of words, at every moment of time, man is commanding himself to be and to possess that which he is conscious of being and possessing.