Question 36. But how are we justified by faith?
Answer: Not because of the worthiness of our faith, as if God justifies us because of it, as the Remonstrants would have it, and [as if] faith is here reckoned as a virtue and a remarkable good work, and therefore as the meritorious cause of the same [i.e. of justification].
…Question 38. How should faith here then be understood?
Answer: As a hand or instrument, whereby we grab and take hold of the righteousness of the Redeemer, hence the sayings ‘take hold of God’s strength’ Is. 27:5; ‘receiving Jesus’ Jn. 1:12; ‘receiving the gift of righteousness’ Rom 5:17 and Acts 26:18.
Question 39. By which analogy do you clear this up?
Answer: Of the beggar who would receive alms of the generosity of a rich man, to which he must stretch out the hand, in which case it [i.e. the hand] deserves nothing, but is only the means by which he receives the gift; or alternatively, of one who in the navigation of the sea capsizes and sees a plank, grabs hold of it, and hauls himself onto it, thereby to be spared.”
—Henricus Siccama (1692–1746), Kort Begrip der Waare Godtgeleertheit, Chapter XVI (On Justification) (Trans. Jake Griesel)