Grace is from God…

Grace is from God, and works in the depth of the soul whose powers it employs. It is a light which issues forth to do service under the guidance of the Spirit. The Divine Light permeates the soul, and lifts it above the turmoil of temporal things to rest in God. The soul cannot progress except with the light which God has given it as a nuptial gift; love works the likeness of God into the soul.
–Meister Eckhart (1260-1328)

The grace of God…

When the grace of God comes to us we can do all things, but when it leaves us, we become poor and weak, abandoned, as it were, to affliction. Yet, in this condition we should not become dejected or despair. On the contrary, we should calmly await the will of God and bear whatever befalls us in praise of Jesus Christ; for after winter comes the summer, after night comes the day, and after the storm, a great calm.
— Thomas a Kempis (1380-1471)