According to Aquinas, formally speaking, the divine exemplarity depends on ideas existing in the mind of God. However, to interpret this statement within the context of Trinitarian monotheism requires consideration of the exemplary condition of both the divine essence and the personal Logos. It is necessary, therefore, to reflect on two pairings simultaneously: essence ideas and Logos-ideas. The fi rst is clarified by studying divine knowledge, the other by analysing the manifestation of creatures through the divine Word. This paper explores these two sets of ideas independently and in relation to one another in order to show their harmonic convergence in the Thomistic maxim: Deus est primum exemplar omnium.