As an employee (yes, “slave”), if you put your faith in people to reward you for your passion, loyalty and hard work.. you may be disappointed.
Don’t hold it against them. Put your faith in God, He will not disappoint.
Slaves, obey in everything those who are your earthly masters, not by way of eye-service, as people-pleasers, but with sincerity of heart, fearing the Lord. Whatever you do, work heartily, as for the Lord and not for men, knowing that from the Lord you will receive the inheritance as your reward. You are serving the Lord Christ. (Colossians 3:22-24 ESV)