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Are you getting at the idea that love for Christ is the motivator, then asking, How can I love Christ more?
Sanctification is a benefit of justification, it's a package-deal from what I understand; if you are justified, you will be being sanctified in this life. Effort doesn't do it, for the reasons John stated so well, trust in Jesus and what He has done for us is a means both to loving Him more and to sanctification, so in that sense it probably is by faith.
Sanctification-by-faith is a buzzword of Wesleyans and other revivalist perfectionists, so you might get some sparks if you use that phrase here. I'm sure you didn't have that in mind, though.
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