The statement in the example sentence can arise only in a situation where the speaker's love has undergone a change. But has the speaker's love remained at a constant level overall, with the amounts devoted to its various component subcategories altered, or has the total quantity of the speaker's love increased, with the allocations to all or some of the component subcategories increased as a result? That's what we need to determine from the speaker's statement.
For ease of description, let's call the speaker's love for man M, the speaker's love for Nature N, and the speaker's total love T; and for simplicity, let's suppose that the totality of the speaker's love consists entirely of the combined amounts of those two component subcategories—man and Nature. Then we can describe the speaker's total quantity of love before things changed as T1, the speaker's love for man at that time as M1, and the speaker's love for Nature at that time as N1. That gives us this simple equation for the person's total love in the earlier time period: