God knoweth we have nothing of ourselves, therefore in the covenant of grace he requireth no more than he giveth, and giveth what he requireth, and accepteth what he giveth.
Richard Sibbes from The Bruised Reed
Indeed the Word of God is like the sun, shining upon all those to whom it is proclaimed, but with no effect among the blind. Now, all of us are blind by nature in this respect... Accordingly, it cannot penetrate into our minds unless the Spirit, as the inner teacher, through his illumination makes entry for it.
John Calvin Institutes 3.2.34.
If any man doth ascribe of salvation, even the very least, to the free will of man, he knoweth nothing of grace, and he hath not learnt Jesus Christ aright.
...the first effect of the power of God in the heart in regeneration is to give the heart a Divine taste or sense; to cause it to have a relish of the loveliness and sweetness of the supreme excellency of the Divine nature.