What should we do when we feel unworthy of serving God?

The sermon emphasizes that previous wickedness or feelings of unworthiness should not hinder our obedience to God. The Israelites acknowledged their sinfulness but were assured by Samuel not to turn aside from following the Lord. This grace extends to us today; regardless of our past, we are urged to confess, repent, and serve God with diligence. God desires to draw near to those who recognize their shortcomings, and His guidance enables believers to fulfill their calling in His service despite imperfections.