Waiting upon the Lord does not mean sitting around doing nothing and
waiting for the Lord to suddenly appear in the clouds or to perform
some great miracle.
Waiting upon the Lord means to wait on the Lord like a waiter serves
a guest at a table; taking the guest's order and filling the order
with dignity and patience.
Brethren, we must serve the Lord with patience and longsuffering all
the days of our lives without grumbling nor complaining, but with
thankful heart filled to overflowing with zeal born of the hope of His
coming.
This is what is meant by the scripture, But they that wait upon the
Lord shall renew their strength; they shall mount up with wings as
eagles; they shall run, and not be weary; and walk and not
faint.