Do not regret tamas ,but when sattva comes into play ,hold on to it and make the best of it.—Maharishi Ramana.
Comment; The mind has been divided by three mods according to Vedanta. When mind is cool and peaceful this mode is called sattvica, when mind occupied with worldly obstacles then this mode called Rajas and mind is lazy, sleep, and can’t discriminate between real and unreal then called tamas. tamas we can’t do meditation, some. People upset that time. our mind works according to our tendencies of this life and previous lives. these three mods changes every time, It’s not in our hands.so Maharishi told as his teaching notcomes regret that time when Sativa comes do your best for practice of meditation.