"Self-Improvement in Workers If the worker has consecrated himself fully to God and is diligent in prayer for strength and heavenly wisdom, the grace of Christ will be his teacher, and he will overcome his defects and become more and more intelligent in the things of God. But let none take license from this to be indolent, to squander time and opportunities, and neglect the training that is essential in order to become efficient. The Lord is not pleased with those who, having had opportunities to obtain knowledge, neglect to improve the privileges placed within their reach.... CT 510"
"But grow in grace, and in the knowledge of our Lord and Saviour Jesus Christ. To him be glory both now and for ever. Amen."
Both passages encourage growth in grace and knowledge. 2 Peter 3:18 is a direct exhortation to grow, while EGW emphasizes the importance of diligence in prayer and the grace of Christ as a teacher for self-improvement.