God schedules a birthday, not man.

The line asserts a theological view of human life as providential rather than self-determined: the timing of one’s birth is ultimately set by God, not chosen or controlled by human beings. Read this way, “birthday” stands for the larger fact of existence—life begins by divine appointment, implying limits on human autonomy and a call to humility. The aphoristic phrasing also suggests comfort or reassurance: because life’s beginning is not accidental or merely bureaucratic (scheduled by “man”), it has purpose within a divine order. Depending on context, it may also function as a critique of human attempts to manage or redefine life’s boundaries.