The subsistence level is only a conventional idea, and conventions change.

He was blessed with an unconventional mind, which overcame his conventional middle-class upbringing.

The strength of the scientific establishment in any country is related to its general level of education, not only in supplying large numbers of eager minds for further training, but also in ensuring a public opinion that holds science in esteem and approves financial support.

It is interesting that people are trying to change the conventional methods,

And We have made in it means of subsistence for you and for him for whom you are not the suppliers.

Change alone is eternal, perpetual, immortal.