Final answer:
The line 'I, now thirty-seven years old in perfect health begin, Hoping to cease not till death. Creeds and schools in abeyance,' signifies setting aside traditional beliefs and educational systems for personal exploration.
Step-by-step explanation:
The line from the poem that best communicates what it means to hold "creeds and schools in abeyance" is "I, now thirty-seven years old in perfect health begin, Hoping to cease not till death. Creeds and schools in abeyance,". This line indicates the speaker's intention to set aside formal doctrines and educational systems to embark on a journey of self-discovery and personal understanding. It emphasizes a break from the constraints of established institutions and traditional beliefs to embrace a more personal and direct engagement with life and its experiences.