1. strict or thorough in the performance of duty: a faithful worker.
2. true to one’s word, promises, vows, etc.
3. steady in allegiance or affection; loyal; constant: faithful friends.
4. reliable, trusted, or believed.
5. adhering or true to fact, a standard, or an original; accurate: a faithful account; a faithful copy.
6. Obsolete . full of faith; believing.
So be a faithful friend, faithful in your religion, believe, be faithful in your relationships, etc.
How will you be faithful today?