O Age that half believ'st thou half believ'st,
Half doubt'st the substance of thine own half doubt,
And, half perceiving that thou half perceiv'st,
Stand'st at thy temple door, heart in, head out!
Lo! while thy heart's within, helping the choir,
Without, thine eyes range up and down the time,
Blinking at o'er-bright science, smit with desire