Yes, because Christ is the EMBODIMENT of the Gospel, and Christ is the Power of God (1 Cor 1:24).
Sorry, can't get off from truth.
Plugged in to Christ - the ONLY source of power, first before one can have the power to do the act of "Calling". Plug that electric bulb first to the source of power, then it will shine. It does NOT shine first so it could be plugged in.
How can they hear UNLESS they first have the power to hear?
"The heavens declare the glory of God."
People have the power to hear. Like a mouth can taste good food, so too can the heart taste truth.
It is up to them if they want to listen.
Nope.
You have already said that "see" & "hear" first, then one "believes". But BEFORE one can "see" or "hear", he must first be PLUGGED IN to the ONLY source of power - Christ. Without Christ first and foremost, all human acts are NOTHING. John 15:5
And in numerals NOTHING is ZERO (0). Without Christ the ONLY (1) source of Power, "see", "hear" & "believe" are all "0","0", & "0". But with Christ FIRST & FOREMOST, they become "1000".