QUES: If you can take it in your stride you will pass through such periods with relative ease

correct the punctuation.

CORRECTED: If you can take it in your stride you will pass through such periods with relative ease.

QUES: White Sun knows his task and performs it till the end As an example a model of the White Sun is a concept which is use Obviously that such a system presupposes the development of integrity clear conscience and freedom to choose their own movement

correct the punctuation.

CORRECTED: White Sun knows his task and performs it till the end. As an example, a model of the White Sun is a concept which is use. Obviously, that such a system presupposes the development of integrity, clear conscience and freedom to choose their own movement.

QUES: As to the Mathematical Society of which I was a member when only 18 years of age having been contrary to the rules elected under the age of 21

correct the punctuation.

CORRECTED:
As to the Mathematical Society, of which I was a member when only 18 years of age, having been, contrary to the rules, elected under the age of 21.