As a father, there have been many times I told my children 'no' simply because I was not able to do what they were asking. I have my limitations. But our Heavenly Father has no such limitations, He is able to do all that we ask and more, far more. When God says 'No' it is not because He is unable to do what we are asking...
Now unto him that is able to do exceeding abundantly above all that we ask or think, according to the power that worketh in us, unto him be glory in the church by Christ Jesus throughout all ages, world without end. Amen. ~ Ephesians 3:20–21 (KJV)
When God says 'No' it is because He loves us. He knows what's best for us. He is so far above the 'If you loved me then you would...' manipulation that we so often fall prey to. When God says 'No' just trust Him.
Have A Great Weekend!