Same entry in other lexica. The headword phrase must be quoted from somewhere: the New Testament (Philippians 3.14) according to Theodoridis on Photius s.v., who also notes an instance of kata\ to\n skopo/n in Xenophon.
For mark/objective/target cf. generally sigma 662; and for prepositional phrases with skopo/s -- though not this one -- see LSJ s.v., II.1.
[1] Bernhardy wanted to add 'and' before 'necessary'.