It is in Scripture, though.
1 John 5:14
This is the confidence which we have before Him, that,
if we ask anything according to His will, He hears us.
Indeed it is, and just as true as what is written in Mk 11:23-24.
But what you might not be seeing is, God already said what His will is in those two verses.
And not only that, but He also said, "This is a true statement..."
Which means, it's true as is. It doesn't need help from other verses from the bible to make it the whole truth or council of God.
On the contrary, it perverts and twists what is written into a lie.
If it is the truth as it is written, like Jesus said it is, how are you making it more true by adding "the will of God" to it?
If I gave you a paper saying, 'This is a true statement, in an of itself. You can have whatever you want in this store if you do such and such, I will buy it, and it will be yours.'
So you, in your excitement, go to get one item and bring it back to me saying, 'I did what you said, and I chose this.'
But then I say, 'I'm sorry, it is not my will for you to have that.'
What would you say?
'You lied to and deceived me. What you said was false, You said such and such, and nothing about me having to choose what you wanted or what your will was for me to have or not to have.'
What if I were to draw up a contract and you agreeing to the terms, sign it, and I later tried to add something to said terms without it being written in the contract?
Most people would take the other party to court for breach of contract, right?
I understand about adding other verses to support a doctrine or scripture verse for clarity, but when Jesus says, "This is a truthful saying..., or verily verily I say unto you...," to add anything to said verses, is NOT adding for clarity sake or for support, but changing the very meaning and context of those verses, thereby making, what was the truth, into a lie.
It changes what is being said.
To give you a better perspective of what I'm saying, let's do the same for some other verses in scripture.
Rom 10:9 That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
[if it is the will of God]
Joh 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
[if it is the will of God]
Did that portion of verse in John 5:14 do anything to the meaning or change the context of the statements in any way?
It most certainly did, and that is exactly what you and others are doing to the other promises of God, such like the kind written in mk .
After the "will of God" was added, it change a solid promise and guarantee into hoping, wishing, and wondering if it is God's will for them to save them if the believe in Jesus.
By adding those few word, I just made the truth of God's PROMISES, into a lie, and both perverted and corrupted said truth.
Maybe to you, it is not as black and white, but to me, it is doing the same as what I did to the salvation scriptures.
His will is already written, we need to stop adding or using other scripture like the above to explain away our failure, or that of others, to receive from God.
It also takes away the faith one might have had in that promise, from being
confidently assured, to, 'I wonder what God is going to do?'
There is absolutely NO FAITH in that, and how could you, when you don't know what God will do or what His will is?