You can get resources from another context the same way as you would get any other resource - you just have to make sure that the permissions are set correctly in the other contexts. For example, if you have a resource with an id of 55 in context ’development’ you simply retrieve the object with:
$modx->getObject('modResource', 55);
Or something similar.
God does not save those who are only imaginary sinners. Be a sinner, and let your sins be strong, but let your trust in Christ be stronger, and rejoice in Christ who is the victor over sin, death, and the world.