Samuel Johnson, Obstructions of learning:
It is the great excellence of learning, that it borrows very little from time or place; it is not confined to season or to climate, to cities or to the country, but may be cultivated and enjoyed where no other pleasure can be obtained. But this quality, which constitutes much of its value, is one occasion of neglect; what may be done at all times with equal propriety, is deferred from day to day, till the mind is gradually reconciled to the omission, and the attention is turned to other objects. Thus habitual idleness gains too much power to be conquered, and the soul shrinks from the idea of intellectual labour and intenseness of meditation.
Beware that “what may be done at all times with equal propriety, is [quite easily] deferred from day to day, till the mind is gradually reconciled to the omission, and the attention is turned to other objects.”