It is a universal principle that whenever one refuses to use his God-given powers, these powers decay and perish.
Ellen G. WhiteModerate exercise every day will impart strength to the muscles, which without exercise become flabby and enfeebled.
Ellen G. WhiteThe soul that is yielded to Christ becomes His own fortress, which He holds in a revolted world, and He intends that no authority shall be known in it except His own. A soul thus kept in possession by the heavenly agencies is impregnable to the assaults of Satan.
Ellen G. White