הַמַּסּוֹת֙ הַגְּדֹלֹ֔ת אֲשֶׁ֥ר רָא֖וּ עֵינֶ֑יךָ הָאֹתֹ֧ת וְהַמֹּפְתִ֛ים הַגְּדֹלִ֖ים הָהֵֽם׃
the great trials which thine eyes saw, the signs and those great wonders;
Read kabbalistic (mystical) interpretation of Deuteronomy 29:2: and classical mystical sources.