The essense of living success is to keep the mind focused on God Himself -- not merely, be it noted, on His works or purpose or service. It is possible to miserably fail by allowing the means to obscure the end -- or even become the end.
It is possible to work intensely all day with great enthusiasm in the "service" of God, without even thinking of God Himself at all. That "service" is as useless as a papist's beads, or blind Israel's dead, wooden rituals. All that we do must be consciously centered upon and directed toward God Himself, as a Person, in intense love -- just as the natural mind, amid all changing circumstances and activities, will gravitate irresistibly and obsessively toward the one person upon whom its affection is fixed. What we think and say and do in a few moments of relaxation at the end of the day may be a much more accurate revelation of our character and personality than the whole day's virtuous and laborious but perverted self-satisfying "service" to God. God seeks -- not great works -- but our simple faith in and all-absorbing love of Him. These will, if real and true, inevitably bring forth the greatest works we are capable of: but the works are the by-product -- the central essence is personal, conscious, love and remembrance of God.