To this period of comparative security one psalm has been supposed to belong--the xxxi., which, in tone and in certain expressions, corresponds very well with the circumstances. There are many similarities in it with the others of the same period which we have already considered--such, for instance, as the figure of God his rock (ver. 3), the net which his enemies have laid for him (ver. 4), the allusions to their calumnies and slanders (vers. 13, 18), his safe concealment in God (ver. 20: compare xxvii. 5; lvii. 1; xvii. 8, etc.), and the close verbal resemblance of ver. 24 with the closing words of psalm xxvii. The reference, however, which has been taken as pointing to David's position in Ziklag is that contained in the somewhat remarkable words (ver. 21): "Blessed be the Lord, for He hath showed me His marvellous loving-kindness in a strong city." Of course, the expression may be purely a graphic figure for the walls and defences of the Divine protection, as, indeed, it is usually understood to be. But the general idea of the encompassing shelter of God has just been set forth in the magnificent imagery of the previous verse as the tabernacle, the secret of His presence in which He hides and guards His servants. And the further language of the phrase in question, introduced as it is by a rapturous burst of blessing and praise, seems so emphatic and peculiar as to make not unnatural the supposition of a historical basis in some event which had recently happened to the psalmist.