With good fortune we have reached the final mishnah of Maseches Menachos - chapter 13, mishnah 11. The mishnah closes the tractate on an inspiring note.
The words of the mishnah:
"Ne'emar b'olas ha'behemah: isheh rei'ach nicho'ach laHashem" - regarding an animal offering, which is a very expensive offering, the Torah says (Vayikra 1:9) that the fire offering is a pleasing aroma before Hashem.
"Uv'olas ha'of: isheh rei'ach nicho'ach laHashem" - when the offering is a bird rather than an animal, an offering of lesser value, the very same words are used (Vayikra 1:17).
"Uv'minchah: isheh rei'ach nicho'ach laHashem" - even regarding the meal offering, the least expensive of the offerings, those exact same words appear again (Vayikra 2:2).
This threefold repetition comes "l'lameid she'echad ha'marbeh v'echad ha'mam'it" - there is no difference in quantitative terms between one who brings much and one who brings little, between a wealthy person bringing an expensive offering and a poor person bringing an inexpensive one. What matters is "uvilvad she'yechavein adam es da'ato la'Shamayim".
The decisive factor is a person's intention and his effort to connect to his Creator. Hashem has no need of animals, birds or meal offerings; all of these are merely vessels and a means through which a person gives of himself and draws close to Hashem - and that is the essence of a korban. Therefore the actual cost of the offering is not what counts, but the thought behind it: "Rachmana liba ba'i" - the Merciful One desires the heart.
From the offerings to prayer and Torah study:
Although this principle was stated regarding offerings, and there are no offerings nowadays, the Mishnah Berurah already writes in siman 1 of Orach Chaim - literally the first siman in the Shulchan Aruch (s"k 12) - that the same principle applies to the recitation of supplications and requests, such as Tikkun Chatzos, Selichos and even Pesukei D'Zimra: a person must do the best he can, and quantity is not the point, quality is. One who cannot keep up with the pace of the congregation, whether because they are rushing excessively or for some other reason, should stand with the congregation and do what he is able to do - and what matters is the effort he invests and how present he is in the words he is saying.
The same is true of Torah study: some have been blessed with more free time, some have been blessed with greater ability, and some have been granted by Hashem resources that others do not have. One's level of commitment to Torah study is measured by the effort each person exerts and pushes himself to make according to his own strength. A person's best - that is precisely what is asked of him, no more and no less.
In summary: the mishnah that closes the tractate teaches, from the threefold use of the phrase "isheh rei'ach nicho'ach laHashem" regarding the animal olah, the bird olah and the meal offering, that the difference between one who brings much and one who brings little is not what counts, but rather the intention of the heart toward Heaven. This principle applies as well to prayer, to supplications and to Torah study: the thought and the effort are what count.
And with this we complete, with siyata d'Shmaya, Maseches Menachos. The next tractate - Maseches Chullin.