If you hold a rock in your hand and blow against it, nothing happens.
Or so it seems.
Something does happen, dust is vacated.
More dust is generated by the surface of the rock being exposed to yet more gusts.
Another pulse of breath, and that dust is gone.
From attempt to attempt, the naked eye sees nothing.
Yet from attempt to attempt, the rock yields to the movement of air.
Effort does not go without effect. Work does not go without results.
Maybe not seen on a daily basis, the long term results cannot be denied.