Press with determination in the right direction, and circumstances will be your helpers, not your hindrances. Christ’s Object Lessons, p. 332.
It is not God that blinds the eyes of men or hardens their hearts. He sends them light to correct their errors, and to lead them in safe paths; it is by the rejection of this light that the eyes are blinded and the heart hardened. Often the process is gradual, and almost imperceptible. Light comes to the soul through God’s word, through His servants, or by the direct agency of His Spirit; but when one ray of light is disregarded, there is a partial benumbing of the spiritual perceptions, and the second revealing of light is less clearly discerned. So the darkness increases, until it is night in the soul. Desire of Ages, p. 322