Angel and Devil

There are 3 men in these story ,among of them 2 men are same(like copy of each other) nobody can identify.Both are be able to see future.So one man said to third one 'you will lose your strength "let me help you" to get your strength.Other one said'you will lose your strength"i will help you"to get your strength'.... so, how the third man be able to understand who is angel &who is devil.

Easy Math Editor

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`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
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Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$