Preparing yourself to serve Jesus fills you with His power and grace.

“So Jotham became mighty [chazaq], because he prepared [kun] his ways before the LORD his God.” (2Chr 27:6)
“You therefore, my son, be strong [endunamoo] in the grace [charis] that is in Christ Jesus.” (2Tim 2:1)
“My grace is sufficient for you, for My strength [dunamis] is made perfect in weakness. Therefore most gladly I will rather boast in my infirmities, that the power [dunamis] of Christ may rest [episkenoo] upon me.” (2Cor 12:9)
“Watch, stand fast in the faith, be brave, be strong.” (1Cor 16:13)
“Finally, my brethren, be strong in the Lord and in the power of His might.” (Eph 6:10)
“Now to Him who is able to do exceedingly abundantly above all that we ask or think, according to the power that works in us” (Eph 3:20)
“that I may know Him and the power of His resurrection, and the fellowship of His sufferings, being conformed to His death” (Phil 3:10)
“strengthened with all might, according to His glorious power, for all patience and longsuffering with joy” (Col 1:11)
“Be strong and of good courage, for to this people you shall divide as an inheritance the land which I swore to their fathers to give them.” (Josh 1:6)
“Only be strong and very courageous, that you may observe to do according to all the law which Moses My servant commanded you; do not turn from it to the right hand or to the left, that you may prosper wherever you go.” (Josh 1:7)
“Have I not commanded you? Be strong and of good courage; do not be afraid, nor be dismayed, for the LORD your God is with you wherever you go.” (Josh 1:9)
“Therefore if anyone cleanses himself from the latter, he will be a vessel for honor, sanctified and useful for the Master, prepared [hetoimazo] for every good work.” (2Tim 2:21)
Reading: 2Chr 26-28; Rom 4