We can usually see little on a flight. Just as when, on an aircraft, we have little glimpses of bright fields or snowy mountains, so, in the spiritual life, God allows us 'glimpses' of spiritual joys, because He knows one of our greatest dangers is discouragement, and wants us to know that we are on our way to Heaven.
Christ assures us that we need not feel guilty about weeping occasionally, when we are saddened by incidents or circumstances - though He does ask us not to give in to discouragement but to turn to Him in trusting prayer to find new strength. He Himself was upset when His friend Lazarus died. He understands all our sorrows.
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