וַיֶּאֱהַ֥ב יַעֲקֹ֖ב אֶת־רָחֵ֑ל וַיֹּ֗אמֶר אֶֽעֱבָדְךָ֙ שֶׁ֣בַע שָׁנִ֔ים בְּרָחֵ֥ל בִּתְּךָ֖ הַקְּטַנָּֽה׃
And Jacob loved Rachel; and he said: ‘I will serve thee seven years for Rachel thy younger daughter.’
Read kabbalistic (mystical) interpretation of Genesis 29:18: and classical mystical sources.