Why is understanding the means of grace important for Christians?

In the context of Joshua 3, the Ark of the Covenant was the means by which the Israelites would cross the Jordan River and enter the promised land. Christians understand this Ark as a picture of Christ, representing the means through which they can come to God. The emphasis on the Ark being borne by the priests highlights the calling of God's ministers to elevate Christ in their teaching. By recognizing the means of grace, believers learn to look solely to Christ for their spiritual journey and salvation, understanding that it is through Him alone that they find safety and direction in crossing into eternal life.