Joshua 1

The Lord counseled Joshua as he was called to lead the children of Israel -

"...as I was with Moses, so I will be with thee: I will not fail thee, nor forsake thee.
6 Be strong and of a good courage: for unto this people shalt thou divide for an inheritance the land, which I sware unto their fathers to give them.
7 Only be thou strong and very courageous, that thou mayest observe to do according to all the law, which Moses my servant commanded thee: turn not from it to the right hand or to the left, that thou mayest prosper whithersoever thou goest.
8 This book of the law shall not depart out of thy mouth; but thou shalt meditate therein day and night, that thou mayest observe to do according to all that is written therein: for then thou shalt make thy way prosperous, and then thou shalt have good success.'  (Joshua 1:5–8)

Great counsel to anyone that accepts a calling.