Salvation is by grace alone

"Our subject is, of course, rich in meaning and presents several aspects. To say that we are saved by e expresses the truth that salvation is of the Lord. This should be emphasized from the outset. For gace is of God, and God is free and sovereign. To be saved by grace, then, means that grace is the only source, the sole explanation, the ultimate reason and ground of our salvation, the efficient cause of all that is implied in the work of our redemption and deliverance from sin and death. We are saved by grace only, without the work or cooperation of man, or we are not saved by grace at all. hence, one who would speak of salvation by grace, must understand that he is speaking of a divine work throughout." Herman Hoeksema in Wonder of Grace

Though Hoeksema is great on some things, I do not necessarily think he is the clearest theologian. Yes I do like some of the things I have read from him. He is not necessarily clear or concise. One might read Gordon H. Clark.