What quality does the speaker praise in sonnet 116?

In Shakespeare's Sonnet 116, the speaker praises the unwavering and everlasting nature of love. They describe love as a bond that is not subject to change or external forces, stating, "Love's not Time's fool, though rosy lips and cheeks/ Within his bending sickle's compass come." Despite the passage of time and the physical changes that come with aging, the speaker asserts that true love remains constant and unaffected. This enduring quality is what the speaker praises and celebrates throughout the sonnet.