《荀子·子道》
即使有了全国闻名的大力士的力气，也不能自己举起自己的身体，这不是没有力气，而是客观情势不许可。
虽有国士之力，不能自举其身。非无力也，势不可也。
Even with the strength of a renowned strongman, one cannot lift oneself up. This is not due to a lack of strength, but because the situation does not allow it.