And there is not a thing but its (sources and) treasures (inexhaustible) are with Us; but We only send down thereof in due and ascertainable measures.
All the wonderful gifts and forces and energies
which we see in the world around us have their sources
and fountain-heads with Allah, the Creator and Sustainer
of the Worlds.
And what we see, or perceive or imagine is just a small
portion of what exists. That portion is sent out to us and
to our world according to our needs or its needs from
time to time as the occasion arises. It is strictly limited
according to rule and plan. Its source is unlimited and
In the same way the forces which we see operating
around us, in nature or in the spiritual world, according
to laws which we can grasp and, ascertain, are mere
derived forces, in the 2nd, 3rd, or nth degree. Their
source and ultimate fountain head is with Allah.
Yusuf Ali, Abdullah. Translation and Commentary of the Quran. (surah 15 verse 21). Microsoft Word – 015 Hijr.doc (quran4u.com)