Read it through once

“I say that man was made to grow, not stop; That help he needed once, and needs no more, Having grown up but an inch by, is withdrawn: For he hath new needs, and new helps to these. This imports solely, man should mount on each New height in view; the help whereby he mounts, The ladder-rung his foot has left, may fall, Since all things suffer change save God the Truth. Man apprehends him newly at each stage Whereat earth’s ladder drops, its service done; And nothing shall prove twice what once was proved.”