Faith is not believing that God can. It is knowing that God will.

The saying draws a sharp line between two kinds of religious assent: intellectual acknowledgment of divine power (“God can”) versus confident trust in divine intention and providence (“God will”). It frames faith not as a tentative hypothesis about what is possible, but as a settled assurance about what will occur, implying certainty about outcomes. As a piece of devotional rhetoric, it encourages believers to move from abstract theism to reliance and expectation. At the same time, the formulation raises classic theological questions: whether faith should entail certainty about specific events, and how such certainty relates to unanswered prayers, suffering, or the idea that God’s will may differ from human desires.