CHRYSOSTOM:
If ignorant, how could they be sorrowful? Because they were not altogether ignorant. They knew that he was soon to die, for they had continually been told about it. But just what this death might mean, they did not grasp clearly, nor that there would be a speedy recognition of it, from which innumerable blessings would flow. They did not see that there would be a resurrection. This is why they grieved.
AUGUSTINE:
Observe a tree, how it first tends downwards, that it may then shoot forth upwards. It fastens its root low in the ground, that it may send forth its top towards heaven. Is it not from humility that it endeavors to rise? But without humility it will not attain to higher things. You are wanting to grow up into the air without a root. Such is not growth, but a collapse.