Add to your faith virtue, to virtue knowledge, to knowledge self-control, to self-control perseverance, to perseverance godliness, to godliness brotherly kindness, and to brotherly kindness love. For if these things be in you and abound, you will be neither barren nor unfruitful in the knowledge of our Lord Jesus Christ.

— 2 Peter 1:5-7

Faith is the foundation, but add to your faith virtue (or goodness); and to goodness, knowledge, and to knowledge, self-control, etc.—It sounds like a progression, each building on the one before to continue growing, expanding, each one adding more depth and dimension to our faith.
     About adding knowledge to goodness, it sounds like one must know right to be able to do right. In other words, adding knowledge helps me see how to apply my faith. Does that mean it’s not enough simply to believe? Though I do believe, I need to keep growing in knowledge and understanding, and thereby in relationship. Relationship with God is not static, I’m either learning and growing … or I’m not.
     Regardless of how good the material may be, if the student doesn’t try or want to learn, it becomes an exercise in futility. What I learned years ago isn’t enough to sustain me today.
     We must think seriously about this life, it’s our soul’s preparation for eternity.

The sweetness of God’s presence in our soul in this life is what makes us yearn for eternity. If I find in myself a desire, which no experience in this world can satisfy, the most probable explanation is that I was made for another world.

— C.S. Lewis