Halliday & Matthiessen (1999: 235):
If we view a set of metaphorically agnate wordings synoptically, any member of such a set appears metaphorical by reference to all the others. Given the announcement [was made] of his probable resignation and he announced that he would probably resign there is no reason to say that either is the less metaphorical. But if we view them dynamically, taking account of their relation in time, then in all three histories the same one precedes: he announced that he would probably resign comes before the announcement of his probable resignation. It evolved earlier in the language (phylogenesis); it is learnt earlier by children (ontogenesis); and it typically comes earlier in the text (logogenesis).