God tells us to receive with meekness the engrafted word, that it’s able to save our souls. (Ja 1:21) He tells us this after affirming He’s chosen to conceive us by His own will, not our own, with the word of truth (Ja 1:18); so, this salvation can’t be justification (Ro 4:25); it must be an ongoing process, something He’s performing in us now (Php 1:6) through His word. (Ep 5:26)
This word engrafted appears only here in our bible; it means grafted, implanted, transplanted, moved from some place beyond ourselves and permanently seeded and rooted within us. It’s the living expression of God (He 4:12) that becomes a part of our very being (Col 3:16), two distinct living things becoming a single, unique life, God’s words themselves being spirit and life (Jn 6:63), bringing healing within – salvation, deliverance, freedom.
Perhaps this is just another way of God telling us what He’s been saying all along: commanding us to hide His words in our hearts (De 6:6), to meditate in them all the time (Jos 1:8), that we might not sin against Him (Ps 119:11), and prosper in all that we do. (Ps 1:2-3) As we obey Him here He writes His laws into us (He 10:16), enabling us to free ourselves from the lies and bondage of the enemy (2Ti 2:26) so that we might live for Him. (He 9:14)
In seeking all of God, as He is through His Word, obeying all we’re able to obey, He works His words into the fabric of our being, planting them deeply within our minds and hearts, progressively freeing us to obey Him, abounding more and more in us in love for Him and others (Php 1:9), that we might approve what’s excellent, being sincere and without offence until Judgement Day (Php 1:10), filling us with righteousness by and through Christ unto His glory. (Php 1:11)