There are many ways we can serve God diligently, or how to serve the Lord with all your heart, we have 3 simple ways in which you can serve God. 1) First and foremost, we should have the correct attitude towards serving the Lord. Our motives should not be impure or insincere. We should serve Him with a pure heart and a contrite spirit (Psalm 51:17). 2) We should also be willing to put in the effort required to serve the Lord diligently. This means going above and beyond what is required, and doing everything with excellence (Colossians 3:23). 3) Finally, we should always remember that it is God we are serving, and not man. We should do everything for His glory and not our own (1 Corinthians 10:31).